I think someone on here tried to put them on the back of a C5 but they didn't clear something (not the brakes). I wouldn't guess they would work on the front but I am not positive.
I tried 3 different 16" wheels on the front of my 2001 and no go on any of them, I even tried an aftermarket 17" ARE that came of a 92 Vet and it would not fit on the front.