Help with Z06 wheels

[ledoux67]

I know its been covered but the guy im looking at buying them from dosent know if they are off of a C5 or C6, He does know that it is from a 2003 Z06 corvette. I do not know much about the corvette if someone can clear it up for me. I do know they are 17 x 9 1/2 front and 18 x 10 1/2 rear and he said he would take 680.00 cash for the rims and tires that are still in good shape. I am not even going to ask him the backspacing as im sure he has no clue.

Thanks