[BigAls87Z28]

I assume you are talking about rear disk brakes since all third gens came with standard disk brakes up front. Yes, if you get a disk brake rear out of any third gen, they will fit behind 15 inch wheels. Unless you go with a larger brake set up for the front like a 1LE kit, C4HD/C5, LS1, etc etc, you won't need a larger wheel.