Looking for advice on engine mounts

[C.Plavan]

My race motor showed up in its crate today.

I'm debating on the Group N rubber mounts and trans mount, or should I go for the full Cusco engine mounts? I have never been a fan of solid mounts on our Porsche race motors because of harmonics. What is the thought out there with these motors? I'm leaning towards the Group N, but want to see if there are better examples out there for my 818R.

[Frank818]

I have no answer sorry Porsche guy, but what about polyurethane bushings? That's what I run for the motor (very hard rubber on the tranny) and it's just awesome! And my motor, on my VW VR6, is front mounted and FWD, so vibrations would be much of an issue on the steering but it's just amazing.

[Wayne Presley]

I can get the Cusco mounts for $312 for the motor mounts and trans mount.

[StatGSR]

Frank, poly engine mount/inserts don't really apply to subarus, have them in my teg, but nothing like that is available for the suby. I would go with the group n engine and trans mount personally, they are plenty stiff IMO.

[C.Plavan]

Thanks Wayne- I may be sending you another Paypal payment here soon. I just need to decide.
Side note: The shifter is awesome- I may need some ideas on how you installed yours later.

[Wayne Presley]

Thanks Wayne- I may be sending you another Paypal payment here soon. I just need to decide.
Side note: The shifter is awesome- I may need some ideas on how you installed yours later.

Ok, the distributor has 18 in stock right now.

[Mechie3]

I have Cusco knockoff engine mounts. Had them in the subie before the 818. Really limited engine movement. Some nvh increase but not terrible.

[Frank818]

Frank, poly engine mount/inserts don't really apply to subarus, have them in my teg, but nothing like that is available for the suby.

Design reasons that polyU don't apply?

[fateo66]

Frank, poly engine mount/inserts don't really apply to subarus, have them in my teg, but nothing like that is available for the suby. I would go with the group n engine and trans mount personally, they are plenty stiff IMO.

I would go with Cusco mounts over Group N. If you have ever had the hood up on a suby and stepped on the gas enough to activate launch control you would see the motor literally moving 3 inches. The Group N mounts are a harder rubber but they are still the same poor design that allows excessive moment.

[Mechie3]

You don't even need to hit launch control to watch it rock back and forth like a baby swing!

[longislandwrx]

I have the group N mounts and it has very decent engine control. I al also hesitant to run solid mounts.

I used 3m window adhesive to fill in the top area to limit movement even further.

22179

[StatGSR]

Design reasons that polyU don't apply?

I guess when i hear "poly mounts" I typically think of Energy Suspension and or Prothane poly insert options (i use both in all 5 of the mounts for my integra) and yes, for design reasons these inserts do not exist for subarus. Perrin does offer an engine mount that is made with a poly material though, as expected they cost a small fortune.


I would go with Cusco mounts over Group N. If you have ever had the hood up on a suby and stepped on the gas enough to activate launch control you would see the motor literally moving 3 inches. The Group N mounts are a harder rubber but they are still the same poor design that allows excessive moment.

the cuscos just look like reworked rubber suspension bushings turned into motor mounts with a couple plates, doesn't really provide much confidence to me. The Group Ns have been used by many without issue, (many more units sold and installed than any other aftermarket option). I know the engine flops around with the stock mounts, but i have also held both an old factory one and the group n's in my hands and i can tell you that the group n doesn't even feel like it is made out of rubber, it is that stiff when you touch it, and i also know that the NVH isn't over the top with them. To top it off, the whole set with the two engine mounts and the tranny mount is the cheapest option at ~$230. only option that is cheaper is the megan racing ones that are a knock off of the group ns.

[fateo66]

I guess when i hear "poly mounts" I typically think of Energy Suspension and or Prothane poly insert options (i use both in all 5 of the mounts for my integra) and yes, for design reasons these inserts do not exist for subarus. Perrin does offer an engine mount that is made with a poly material though, as expected they cost a small fortune.



the cuscos just look like reworked rubber suspension bushings turned into motor mounts with a couple plates, doesn't really provide much confidence to me. The Group Ns have been used by many without issue, (many more units sold and installed than any other aftermarket option). I know the engine flops around with the stock mounts, but i have also held both an old factory one and the group n's in my hands and i can tell you that the group n doesn't even feel like it is made out of rubber, it is that stiff when you touch it, and i also know that the NVH isn't over the top with them. To top it off, the whole set with the two engine mounts and the tranny mount is the cheapest option at ~$230. only option that is cheaper is the megan racing ones that are a knock off of the group ns.


Yes Cusco mounts have rubber in them (who knows perhaps its the same rubber as the group N mount) but its how they incorporate it that sells me.


To each their own, I'll agree to disagree on this one.

[bompus]

I'm planning on using some Subaru mounts ( same as Group-N I believe ) , part numbers STI D1010FE120 and STI D1010FE110 for the engine and STI D1010FE020 for the transmission. I saw somethere that the engine mounts use Subaru 902380007 nuts. I don't anticipate needing new nuts, but good info to have just in case.

I was also looking into a transmission crossmember bushing kit ( Subaru STI B4100FG000 or Kartboy KAR KB-025 ) , but wasn't even sure if this is applicable on the 818. If anybody has any insight on this, let me know.

[RM1SepEx]

These cusco mts?

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181324879350&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

[Boog]

The transmission cross member bushing goes between the two transmission support braces. Scoobymods install (http://www.scoobymods.com/showthread.php/diy-wrx-sti-whiteline-transmission-12238.html?)

It looks like the transmission mounts directly to the chassis and will not need an additional bushing.
28312

[mikeb75]

<didn't realize how old this discussion was, oops. I'll leave this info here for future reference though>

I will be using torque solutions engine mounts on my S:
http://www.torquesolution.com/Subaru-Wrx-Sti-Engine-Mounts-p/ts-su-200.htm

Picked them up used -owner said they were pretty harsh, but I don't have hands on experience with them yet (sorry). They're definitely going to be stiffer than group N, probably harsher than Cusco also.

[Boog]

They're definitely going to be stiffer than group N, probably harsher than Cusco also.
I'm seeing the Group-N engine mounts listed as having a durometer rating of 88A compared the Torque Solutions mounts at 75A. Everything is taken with a grain of salt, but I think the Group-N bushings will be stiffer.
http://forums.nasioc.com/forums/showthread.php?t=2233376

[Stickshift84]

I am using the torquesolutions mounts on my 818s. As far as I can tell they are stiffer than group N. with the car running and moving around it vibrates less than my 06 mustang with poly engine mounts if that means anything to you. I even overtorqued and broke a stud on one of the mounts and torquesolutions replaced it for free.

[FFRSpec72]

I'm using stock mounts, don't see a need for anything else for road racing. I have been using the stock mounts in my Challenge car w/o any issues and it gets the tar beat out of it.

[Ironhydroxide]

Just buy MSI solid mounts and be done. LOL. Jk

I like the gr.N mounts and have used them on many cars.

[mikeb75]

I believe there is a lot less bushing in the torque solution design, so even if the bushing is less hard there is less material to flex.

[Boog]

I believe there is a lot less bushing in the torque solution design, so even if the bushing is less hard there is less material to flex.

Good point. It's probably the different design that causes it to be a stiffer mount than group-n.

[dougkirkbride]

Just wondering now that there may be more units on the road. has anyone had any issues using the stock mounts. everyone states the engine moves a lot with the stock mounts, does this pose problems with the exhaust holes in the body if I decide to run them there? there are a lot of tight clearances on this car, i guess i am trying to get some more input before i drop my motor in. any advice and opinions are welcome...thanks.

Doug

[Wayne Presley]

I'd do some stiffer mounts myself

[ssssly]

MSI solid mounts. Also have the added benefit of lowering the engine about 8mm.

Or for in between, there are the Beatrush mounts, which I ran on my spec C. Considerably stiffer than the group N or cusco, but still a bit more give than the solids.

[dougkirkbride]

read some more articles on nasioc..... i think i will go with the group N's
Thanks for the input.

[D Clary]

I am going with stock mounts unless I have problems. I don't like solid or overly stiff mounts bolted to aluminum, tends to break stuff. I would rather change a mount than weld up a block or trans. Just my 2 cents.

[C.Plavan]

Just an FYI- This post from me was back last Sept. :) I went Group N, but I'm sure others still need this info.

[Brando]

I went Cusco. Motor still seems to shift a decent amount, no broken aluminum thus far, only rod bearings

[ssssly]

As long as they are torqued properly, you aren't going to break a block with solid aluminum motor mounts. The bolts will sheer before the block cracks.

If you over torque them it can cause stress fracture issues. But you are more likely to crack the mount than the block.

However, since boxers don't have harmonic dampeners, if your rotating assembly isn't very well balanced, solid motor mounts will shake a filling or two loose on the street.

Have always wanted to try machined hockey pucks. Never got around to it though.

[apexanimal]

anyone know of actual differences between the torque solutions, cusco, and beatrush motor mounts?

they all look like the same design...

[jaw777]

Does anyone know the torque specs. from the engine and transmission mount to the frame? I am seeing a lot higher numbers than the FFR manual.

70 for engine and 103 for transmission.

[Bob_n_Cincy]

Does anyone know the torque specs. from the engine and transmission mount to the frame? I am seeing a lot higher numbers than the FFR manual.

70 for engine and 103 for transmission.

33017

33020

[K3LAG]

70 for engine and 103 for transmission.

Those numbers sound high. They sound more like the torque for the bolts that go from the mount to the engine or trans. I know if you try to tighten the trans mount to frame bolts that tight you will likely strip the nut or bolt. I know because I did on my donor mount. Didn't tighten my new Group N mounts as much.

Larry

[philly15]

just looked it up in the manual, engine mount is 62.7 ft lbs. transmission is only like 26 ft lbs. the cross member bolts for the trans are 51.6. i went by this for the engine, and for the trans i felt like 26 was kinda light so i just did the 51.6. seems legit to me.

[Tamra]

We went with the Group N mounts. $209 shipped for the engine and transmission mounts from Subarugenuineparts.com.

[Bob_n_Cincy]

Watch the engine movement when the clutch is pushed in.
This is forth gear. The torque on the axle is 3 times greater in 1st gear.
We definitely need stronger mounts and/or a pitch stop.
Bob

http://youtu.be/jHPyrY8GeZQ

[D Clary]

34457I added this mount to the rear of the transaxle. It is a torque strut off of an 03 Impala. You could probably use a subie one but this one was 12 bucks.

[Jim Schenck]

Perrin makes both Poly engine and trans mounts, they are expensive but very nice parts. Our blue car has group N mounts and red car has the Perrins, less engine movement in the red car but not excessive in the blue one.

[Drew P]

I have the Group N mounts on my WRX. There was definitely a noticeable difference over stock. The recommendation from my local Subaru shop was to go with those over the Cusco mounts since it is mainly driven on the street. For an 818R, that probably isn't going to be a big concern so I would go with the Cusco mounts or solid mounts.

[Turn In Concepts]

With what I have seen so far a trans mount far stiffer than a group n would be good. Group N will work for the engine, but I would do a Cusco mount or similar for the trans due to the torque multiplication.

Let us know if you guys need anything. We have been selling these mounts and making our own for 10 years now for Subarus.

Tony

[Hindsight]

While we are on the subject of engine mounts, is it just me or does $350 for a pair of engine mounts seem insane? That's what the Perrin ones cost.

[Turn In Concepts]

Get the group N for the engine mounts. They are $145 and more than stiff enough for handling movements of the motor.

Tony

[Turn In Concepts]

Get the group N for the engine mounts. They are $145 and more than stiff enough for handling movements of the motor.

http://turninconcepts.com/group-n-engine-mount-set.html

Tony

[Hindsight]

Are they capable of handling 400 WHP and a lot of abuse?

[Turn In Concepts]

Yes. The only time they are really stressed is under heavy launching. I have seen a few fail under this condition, but that is all.

Tony

[RM1SepEx]

you have a group N transaxle mount???

I'm installing my Cusco engine and transaxle mounts right now along with my STI pan, windage tray and pickup, they are orders of magnatude stiffer. I'm worried about engine movement and exhaust going through the bodywork

[ewingate]

Here is a gopro video I made while doing initial go kart testing. It's a short cruise and I don't think I went past second gear but it shows all the engine movement on stock 2002 motor and tranny mounts.


http://youtu.be/DVWVE69xokM

[JeromeS13]

That AWIC looks familiar! Haha

[billjr212]

1 thing that was mentioned very early on in the 818 forums was developing a way to re-use of the pitch stop. I'm surprised in all the discussions here, the pitch stop seems to be ignored and forgotten. I'm sure there must be a way to develop a small bracket that mounts to the strut tower brace to re-use the OEM pitch stop, which should ultimately limit movement in all directions. I am going to be using Group N motor and trans mounts but also plan to look into using the pitch stop and welding up a small bracket as necessary.

[wleehendrick]

Here is a gopro video I made while doing initial go kart testing.

Cool... is that a Flowmaster Super 10? I have one, but haven't completed my exhaust yet. Exhaust doesn't seem too loud, it looks like you have a cat in there too? Also, what BOV/BPV do you have? Doesn't sound like anything else I've heard.


1 thing that was mentioned very early on in the 818 forums was developing a way to re-use of the pitch stop. I'm surprised in all the discussions here, the pitch stop seems to be ignored and forgotten. I'm sure there must be a way to develop a small bracket that mounts to the strut tower brace to re-use the OEM pitch stop, which should ultimately limit movement in all directions. I am going to be using Group N motor and trans mounts but also plan to look into using the pitch stop and welding up a small bracket as necessary.

I also have Group N mounts, but would love to utilize the pitch-stop for additional stability. With all the creativity on the forums, I'm hoping someone will step up to sell a kit! (Craig, are you listening?;))

[Rasmus]

1 thing that was mentioned very early on in the 818 forums was developing a way to re-use of the pitch stop.
Seeing ewingate's video I have to agree. While the power train wasn't bouncing all around there's a lot more movement there than I thought. My first thought was, "Need to find a way to install the pitch stop mount".

[ewingate]

Cool... is that a Flowmaster Super 10? I have one, but haven't completed my exhaust yet. Exhaust doesn't seem too loud, it looks like you have a cat in there too? Also, what BOV/BPV do you have? Doesn't sound like anything else I've heard.

Yep I am using the Flowmaster cat and Super 10 muffler. It's a bit loud but I come from a loud Evo/Sti background so it sounds amazing to me! The BOV is the Turbosmart Race Port from JeromeS along with the AWIC setup :)

[RM1SepEx]

1 thing that was mentioned very early on in the 818 forums was developing a way to re-use of the pitch stop. I'm surprised in all the discussions here, the pitch stop seems to be ignored and forgotten. I'm sure there must be a way to develop a small bracket that mounts to the strut tower brace to re-use the OEM pitch stop, which should ultimately limit movement in all directions. I am going to be using Group N motor and trans mounts but also plan to look into using the pitch stop and welding up a small bracket as necessary.

I've played with it, just no bolt on solution yet...

[Drew P]

It is definitely shocking how much the stock mounts are letting everything move around in that video. I would have thought everything would have been a lot more stable. Maybe those '02 mounts were worn out? If not, I think it is safe to say that Group N should be the minimum and you should go with something stiffer if you are doing anything with a higher HP output than a stock motor.

[biknman]

I got these coming; http://www.allspeedinnovations.com/asi-asi50301-billet-engine-mounts

http://i865.photobucket.com/albums/ab212/AllSpeedInnovations/Billet%20Engine%20Mount%20Kit/IMG_2941_zps3fffdba0.jpg

http://www.iwsti.com/forums/vendor-announcements-project-buildups/274239-billet-engine-mount-kit-new-all-speed-innovations.html

[longislandwrx]

MSI dropped the price on theirs. they are only $195 now

MSIsub05-00-003

http://www.mooresport.com/indexe.php/chassis/impreza-engine-mounts

[matteo92065]

Here is my pitch stop mount...
35271

[D Clary]

I mounted mine at the rear, seemed like better leverage.

[MrDude_1]

I guess when i hear "poly mounts" I typically think of Energy Suspension and or Prothane poly insert options (i use both in all 5 of the mounts for my integra) and yes, for design reasons these inserts do not exist for subarus. Perrin does offer an engine mount that is made with a poly material though, as expected they cost a small fortune.




Perrin makes both Poly engine and trans mounts, they are expensive but very nice parts. Our blue car has group N mounts and red car has the Perrins, less engine movement in the red car but not excessive in the blue one.



While we are on the subject of engine mounts, is it just me or does $350 for a pair of engine mounts seem insane? That's what the Perrin ones cost.


Just so you guys know, the Perrin engine mounts are nothing more than Energy Suspension GM Transmission mounts. part 3.1108 About $23 each. Used to be $12, I guess the cost went up.
They're good mounts, Ive used them on 800+hp 3000lb drag cars and street cars. The 818 will never break them. Perrin makes an angled plate to bolt the trans mount to, and the plate on the otherside is flat.
Anyone with a small manual mill could make a set for the cost of the mounts($46) and some scrap plate.

[longislandwrx]

http://perrinperformance.com/i-13324327-engine-mount-set-for-2002-14-wrx-2004-15-sti.html

that's some pretty fancy machining to do on a manual mill, granted it wouldn't need to look as pretty.

[MrDude_1]

http://perrinperformance.com/i-13324327-engine-mount-set-for-2002-14-wrx-2004-15-sti.html

that's some pretty fancy machining to do on a manual mill, granted it wouldn't need to look as pretty.

Its a flat plate with one angle cut on it. Anything else you do is just for weight/looks.

[Bob_n_Cincy]

I posted my transmission movement on my thread post 276

http://thefactoryfiveforum.com/showthread.php?12534-MRG-MotorSports-818S-Build&p=176260#post176260

[wleehendrick]

I got my new motor/tranny mounts (Group N for all) installed this past weekend.

The motor mounts look somewhat beefier than stock, but the transmission mount is built MUCH more solid. where the stock mount has just a few square inches of rubber connecting the metal plates, the Group N must have 4x the material, and harder. Here's a photo I found that shows the difference:

35623

While it may not be as solid as some of the pricier aftermarket mounts, I have to think it'll be a big improvement. I can't verify this until I go-cart, but seeing how anemic the stock tranny mount is built, I'm not surprised at all the movement people are seeing in a 2WD 818 with no pitch-stop.

Unfortunately, I think I misplaced my mounting hardware, so I need to source a few new flange nuts to install; can someone confirm that they're M10-1.25?

[Jaime]

I got STi transmission mounts from NASIOC for like $20. They have as much rubber as the Group N mounts in your picture, but the rubber isn't as solid. I haven't looked at my engine while the car is running, but I haven't seen any indication that it's moving that much. My coolant fill tank is pretty close to my wastegate actuator and I've not seen any signs of contact yet. My fill tank is bolted to the frame, not the engine.

[tmoretta]

The Impala strut is not a bad idea, but it will not keep the front of the engine from lifting 2-3 inches in first gear. Something must be fashioned (engine torque brace) to control engine movement. I am building a torque brace using a GM trans. mount above the alternator. Pictures will follow soon.

[Bob_n_Cincy]

The Impala strut is not a bad idea, but it will not keep the front of the engine from lifting 2-3 inches in first gear. Something must be fashioned (engine torque brace) to control engine movement. I am building a torque brace using a GM trans. mount above the alternator. Pictures will follow soon.

I just ordered some harder rubber trans and motor mounts. I was thinking of putting the dog bone from the air conditioner compressor bracket to the firewall. I'm going to hold off until I see what you do with the gm trans mount.
Bob

[metalmaker12]

I have group n mounts all around. I am going to make a custom solid tranny mount from my wrx tranny mount to see if it lessions the movement even more. I have to say the groupe n mounts are ideal because there wicked soild and not harsh like solid mounts. I am also making a pitch mount on the cross brace and tranny case.

[Bob_n_Cincy]

I have group n mounts all around. I am going to make a custom solid tranny mount from my wrx tranny mount to see if it lessions the movement even more. I have to say the groupe n mounts are ideal because there wicked soild and not harsh like solid mounts. I am also making a pitch mount on the cross brace and tranny case.

I also thought about the pitch stop going to the crossbar. During 1G acceleration there is about 2000 ft-lbs of torque going to the wheels. So you have the same reactive torque on the engine/trans assembly. I don't know split on how much force goes to each mounting point. I was worried that the crossbar (shock tower bar) would bend. Maybe I'll fire off an email to Jim for his advice.
Bob

[Jaime]

If you ignore roll along the fore/aft axis, the engine and transmission mounts will see the same load. Since the engine doesn't float away or drop out the bottom of the car, the torque induced downwards force on the transmission mount must be equal to the torque induced upwards force on the engine mounts. Since the two are about 30 inches apart, that force would be about 800 pounds each. That's 800 on the pair of engine mounts, or 400 each.

If you add a pitch stop, the force on the pitch stop will depend on its effectiveness. If it holds the engine perfectly fixed, then nearly all the reaction torque will be going through the pitch stop. If it does almost nothing, then it will have very little force on it. The ideal place for it would be high and forward on the engine connecting to a lower point on the chassis, like the bar at the top rear of the tank.

If you connect a pitch stop to the middle of the shock tower brace, expect about a ton of force to be developed there. That force is in the center of a four foot beam. This page (http://metalgeek.com/static/deflection.php) tells me that the brace will bend almost an inch under that load. The 1.5" tube in front of the engine should only deflect about 0.02".

[Jaime]

Keep in mind that adding a pitch stop changes the dynamics of the system. Connecting to the shock tower brace will change the forces on the rubber mounts. Instead of down force in back and up force in front, there will be a large forward component induced in both to counter the pitch stop load. Connecting the pitch stop in front of the engine will almost completely unload the engine mounts and double the downward load on the transmission mounts.

[metalmaker12]

I also thought about the pitch stop going to the crossbar. During 1G acceleration there is about 2000 ft-lbs of torque going to the wheels. So you have the same reactive torque on the engine/trans assembly. I don't know split on how much force goes to each mounting point. I was worried that the crossbar (shock tower bar) would bend. Maybe I'll fire off an email to Jim for his advice.
Bob

I doubt it would bend, it's much stronger then the stock mount

[Scargo]

In the picture matteo92065 posted of his installation of a pitch stop, I believe if the pitch stop were shorter and reversed in the bracket that hangs from the shock tower crossbar so that it faces forward and attaches to the hole in the top of the transaxle that it would then function better for the intended purpose. In my STi the pitch stop looks to tilt down slightly towards the engine from the firewall. What I'm proposing would more closely mimic the stock configuration.
As far as strength of the crossbar goes, I was surprised at the light gauge of some of the tubing in the frame.
However, the pitch stop brackets in my STi are all thin sheetmetal but their plane, as a thin sheet, is in the direction of compression, but mounted against a sheetmetal firewall. I don't know about how the firewall is reinforced internally. Anecdotally, I can say that my firewall buckled when I careened off the Armco at Watkins Glen at 100.

[Bob_n_Cincy]

I asked Jim Schenck @ FRR his advice in motor mounts and pitch stop.
Below is his answer.

Bob,
We cut down the movement by a large amount using the group N mounts so I would try just using those first and see if you still feel the need to add anything. If you still need it I think going forward from the engine to the rear bulkhead would be much stronger than hitting the shock tower cross-brace. If that is to hard to package then putting it down near the trans mount would be my next choice. (because of the length of the lever at the transmission it doesn't need to be as heavy duty down there)
Jim

[Harley818]

Unfortunately, I think I misplaced my mounting hardware, so I need to source a few new flange nuts to install; can someone confirm that they're M10-1.25?[/QUOTE]

Hi wleehendrix, yes I checked last night..... they are M10-1.25


Also, I installed my group N trans mount a couple days ago. It is very much improved and stiffer than stock. Full rubber rather than 3 smaller sections as shown in your picture. I'm hoping it will stiffen up the movement quite a bit. I also have type N motor mounts.

[Samiam1017]

I set my motor in a few days ago(not bolted in) and I just noticed the trans is spaced up 1/2in the motor mounts are setting flat?? The motor mounts are a aftermarket mount that was on a donor car I parted and the trans is a groupn. Any body else have there's set in like this? I'm gonna try and lift the motor with the hoist to see if settles into place better. I don't know how to post pictures but if somebody want them I can text to them and they can post? Thx.

[Scargo]

I see this set of Cusco mounts for the engine and tranny for just over $300 (http://www.ebay.com/itm/Cusco-Motor-Transmission-Mount-Set-Subaru-Impreza-02-05-WRX-STI-EJ205-93-00-/300842220331). These are legit?

[Wayne Presley]

Or you could get them from me for the same price :cool:

[RM1SepEx]

I see this set of Cusco mounts for the engine and tranny for just over $300 (http://www.ebay.com/itm/Cusco-Motor-Transmission-Mount-Set-Subaru-Impreza-02-05-WRX-STI-EJ205-93-00-/300842220331). These are legit?

When I changed to my STI pan etc I also added these Cusco mounts, restart soon, must prep for winter storm tomorrow first!