If you force the 120x5 wheels onto a car MEANT for 5x4.75 you WILL break the studs. Ask me how I know. I recently sold dragknee my Falken Koblenz which were 5x120 that were bolted onto my Camaro 5x4.75 aka 5x120.65 THEY DO NOT FIT. Sure, they mount and etc. but after a few dismounts and remounts the studs will bend and come off with your lugnuts. DO NOT put those wheels on that car unless you want to make the road less safer then it already is. That being said, Vettes are cute
Edit. I ended up replacing every lug which was NO fun. Ask my brother James (Gillbot on here) and a few other guys on LS1tech about running GTO wheels/BMW wheels on a Vette/FBod bolt pattern, it just isn't safe.