[Payton King]

but in case you have not. Lots of the C5 track guys are running 4 Z06rears. I believe that are 18x10.5 on all 4 corners. Locate 2 more rears and run 315's on all 4 corners and then you can rotate. Since yours is mostly a track car you do not need the tight steering and can place steering stops to keep them from rubbing in the front.

Check out ww.corvetteforum.com click forums, then general corvette, then auto cross and road racing section. I think there are a couple for sale in the "race parts for sale" sticky at the top of the page or down in the posts somewhere.