ZZP 370mm Cross Drilled & Slotted Rotors Pair Brembo 6 piston 2009+ CTS-V & Camaro SS ZL1 New. The SS rotors are 355mm for the 4 piston brembo's. They are 370mm for the 6 piston brembos. These work for the 2009-13 Cadillac CTS-V and 2012-15 Chevy Camaro ZL1 Brembo front 6 piston calipers.