I have some Boyd 18x9.5 with 5" backspacing off of my 87 GN. Would these fit on the rear of a 98 camaro? I think the B.S would be a problem.

 

A 9.5" wide wheel is almost 10.5" wide including the bead retainer flanges. If the backspace is 5.0", it means the "frontspace" is 5.5". That puts the outside edge of the wheel/tire about 1.5" outside of the fender.