So im converting my 1998 Pontiac Firebird to ATS Cadillac brembos, ive seen everyone use the 12.6in rotors from a c7 and other models but is it possible to use the c5 corvette rotors instead, they are bigger (12.8in rotors) and fit my bolt pattern but they are thicker by 2mm, I just have no idea if they will fit. If someone has done this let me know.

 

There are a couple of combos that I know to work. The ATS/Regal GS Brembos use the 12.6 rotors. The Gen 6 camaro Brembos fit the LS F-Body spindle and use the 13.6 rotors.

The ATS/Regal calipers fit behind a 17" wheel with minor spacing.

In my case the Gen6 Camaro Brembos fit behind my 18x9.5 et 53 (I think) wheels just as is.