I would like to put 18" ZO6 wheels on my 91. I have been told they won't work, why? They have the same bolt pattern and offset.

 

I have C5 Z06 rims on my 94. They work just fine.

Maybe your wheel arches are too small? I dunno...I doubt it.

 

Back spacing on 3rd gen cars are different then the 4th gen ones. You will require spacers on the front 2" or 2 1/4'" and about the same for the rear. I would search for the correct spacers before buying any WHEELS.......If you don;t know what backspacing is try installing those Z06 clone WHEELS on that 91.