My Deep Dish C6 teaser
No spacers needed, 17x9.5" on all four corners. I have 275/40-R17's on them. The wheels/tires aren't on the car yet because of snow. They're the same offset as C5 Z06's 56mm I'm pretty sure. 
I'll post pics when I got the car sitting on them for good.

I'll post pics when I got the car sitting on them for good.







