Disc Rotor: 67-68 with original 4 piston CalipersOriginally the factory disc brake equiped 1967 68 Camaro & Nova used a special TWO PIECE front disc rotor for the factory FOUR PISTON calipers.. they where essentially a separated disc to hub. This is listed here under the Firebird section also .. as many Camaro's with 4 piston calipers have had the Camaro disc kit retro fitted. Size: 11 inch with a 6. 5" center od hub. This will correctly replace them as a one piece unit and is not like any other