I bought these from a friend for my c5, but decided to go a different direction. They are stock c4 zr1 wheels with tires. The front tires have about 65% life and are 225 50zr 16's and the rears have about 20% life left and are 335 35r 17's making it 17 x 12 wide with the tires. This is a great deal for wheel and tire combo. Asking $700 shipped firm, local pickup is also available at a reduced price. Pm me with any questions!! Thanks for looking.
Here is a shot of the rear of my c5. The left wheel is the zr1 wheel and the right is my stock c5 wheel. Just showing the difference in width.
I got these rims from my friend who had them on his ZR1. He claims that they are OEM, however the front wheels tires show to have 225/50 16's. I'm not trying to scam anyone, just letting everyone know the information.