The basic disc brake rotors are the same for all J-52 brake Camaros, Chevelles (1967-69) and Nova (68 and 69). The grooved rotors (as shown in the auction) started in the 1970 model year. The earlier rotors were not grooved. .965" is the minimum thickness you can cut them down to according to state inspection stations. They can actually be turned down to .935-940" without any issues.........especially on a show car. New, rotors are 1.000" thick.