I know it depends on back spacing, i am not sure what the specs are but i believe they are 18x10.5 Z06 wheels. will a 305-35-18 fit without too much modification, or even a 295 35 18. Is anyone running these size tires and wheels on the rear?

 

I have 295/35/18s on the rear and they fit fine. I had to pound my inner fender a little bit, but other then that it's doing just fine.