The answer is NO, you can not use the existing spindles...they are different. You have to use the 98 and newer spindles to use the LS1 brakes (the brakes are the same on the 6 cyl model as well). I have now done this and the transplant is complete. It is an absolute night and day difference in the braking of the car. The LT1 brakes were horrible in comparison and I hightly recommend to anyone with a 93-97 Camaro/Firebrid to do this. I bought the entire setup at the junkyard, complete pair of spindles, rotors and calipers for $75. Cheap upgrade with lots of results.