Sorry, but I got two spares with my race car when I purchased it. I believe the one closest to me in the picture of both is an s5 and the other is an s4? My car is a 1990 s5 NA. I need to order a transmission rebuild kit for one because the transmission in the car grinds 4th pretty bad when hot (with good synthetic fluid). I haven't found anyone who can decode the ID tag on the transmissions, just the location of the trans mounts. I quickly snapped the photos while I was in the storage loft earlier so these are what I have for now. I can get specific photos of something else later.

 

i say S4 FC, its got the S4 FC mount setup, only car that used that

 

question: how does the S5 mount differ?

 

mounts on bottom vs angled on the sides

 

and the Y bracket uses 2 bolts for the S4 and four bolts for the S5