I have read everything about those adapters that you use so you can fit ZR-1 wheels on our cars. The thing that i am worried about is that they say that there is a 50mm ofset and that is what you should use. I have never seen in any magazines or shops one with a 50mm ofset. The only ones i have seen is 30, 36, and 56. Which ofset have you guys used. These would be on 17 x 9.5.