Can anyone with an LS verify front of frame to valley cover measurement?

[Kbl7td]

Hey guys trying to drop in an LT, the LS and LT are very close in dimensions. Can anyone get this measurement for me so I can see how far aft I need to be?

I’m getting 17.5 to inside of frame.

https://thefactoryfiveforum.com/attachment.php?attachmentid=195279&d=1707001744

https://thefactoryfiveforum.com/attachment.php?attachmentid=195278&d=1707001744

[speedfreak440]

Sorry, I just saw this, I will check mine tonight and respond.

[speedfreak440]

Mine is a little bit tough to measure because I've got a lot of other stuff installed now. But best I can tell 17 and 7/8.