Most people buy rims with the proper wheel spacing. I am sure you could problably get the rotors redrilled, but it would be a pain everytime you needed new rotors. The Z06 wheels have some SERIOUS backspacing, so a spacer isn't going to push them out enough to make a difference.. Front 9.5 wides have about 7" and the 10" rears have about 8"... Compared to the truck 4", that is a serious difference..