doing the 17/18 looks ok if you do 275-40-17 and 295-35-18, but if you try to run the exact same diameter front and rear...it does look out of place. Tim98Z looks good because he has the staggered height

 

Chris, listen to Xsta's comment - this IS the setup you want if you get the ZO6 wheels. FWIW, the smallest positive offset I could find among the many replica ZO6's was +53mm (Dante Designs), but that looks much better than +56mm IMO.

 

Heres mine 18/9.5s all the way around wish I would have got 10.5's in the back they look killer. But o'well here you go.

 

Mine are Rear 18 x 10-1/2 on 275/35, Front 18 x 9-1/2 on 245/40.