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these are the same drilled, slotted and vented rotors that come in our 240sx dual caliper kit with Wilwood calipers or 300ZX OEM Rear calipers. This rotor is zinc plated to prevent rusting. 11.654 inches in diameter.drilled for 4 or 5 lug .Only works with our 240 SX rear dual caliper brake upgrade kits. These rotors are off a 2000 Ford Mustang cobra 5.4 L rear rotor .71 inches thick. Sold a a pair of 2 rotors.