I'm not ABSOLUTELY positive about this, but I think that the GSX did either come with, or have available, the 15x8 road wheel.
i was pretty sure they only made 15x7's, even for gsx's. i think in 71 and 72, although most x's came with road/ralley wheels, different ones could be ordered.
15x7's only. Anything else is aftermarket. Some of the early wheels had a different offset. later Tim
I see there's an auction on Ebay for a pair of "original 15 x 8 Buick Ralley wheels" Had me wondering too.
Look at www.buickperformance.com for an explanation on the '70 GSX wheels, they have a little less backspacing, so appear wider---- I think they are code WG......
