EBC Stage 4 Kit, Rotor Diameter – IN: 13.1, Kit Components: DP31589C, USR7635, S4 Kits Redstuff/Greenstuff 7000 and USR Rotors, Disc Brake Pad and Rotor / Drum Brake Shoe and Drum Kit, Position:Front|EBC Brakes Stage-4 Brake Rotor and Pad Kit.