ls1 rear ends have a smaller hub than lt1's. i ground mine out just a little bit and they fit perfect. i almost **** when i first put my c6 z06's on but that is the only problem. the fronts are fine but the rears need a little material removed. you will run into that with most any wheels for lt1's. the lug nuts center the wheels, the hub centers the rotor.
also, if you are looking cheap, why would you have gotten c6 z06 wheels? the tires, at least good ones, are fairly pricey with larger than stock wheels.
don't put ws6 wheels on a z
