47-55.1 C4 Vette sub frame & running 4 of the same wheel?

[fauXGT]

Are you an earlier or later gen C4?
Mine is an first gen 84, which stock has the exact wheel on all 4 corners.
If you are looking at the later gen, stock might have been different size front to rear with different offsets. I don't know what year your Vette suspension is from. The only reason I went to 16 x 8 with the 4.25 backspacing as my rollers are 6.5 wide with plenty of space, and the widest others have put under these trucks with these suspensions was noted as 8". I may have gone too wide, but all the wheels are identical to keep the footprint equal.
With medical issues happening, the only thing I've done is dry fitted the wheel alone on the rear with the fender hanging on the bed last fall. Talked to my tire guy today to say I'll be down in a couple of months with one wheel and a list of tire sizes to keep height required. I might have to order new narrower wheels if they are too wide.