getting to the point where I'm going to test fit the engine

I spray-painted the raw steel bracket to reduce corrosion
in assembling the transmission mount it seems there are 6 'extra' bolts
are the plated ones in the bag used to mount to the chassis?

IMG_5227.jpg

Given the pics from the manual, I put the 1.5" bolts from the mount to the adjoining bracket with the locknuts
the manual says for the bracket to use 1.5" bolts, but all I have are the 1.7" bolts, will they be too long?

Screenshot 2022-06-25 195929.png

here's what I believe the manual result should look like

IMG_5229.jpg

what do those bolts mount into on the transmission? are nuts needed? or just thread into the inner threads shown in the pic below?
IMG_5230.jpg

sorry for the odd questions, obviously first time figuring this out