Rear. Narrow. Black center. Dimensions: 11.5" OD, 51mm ID, 3/8" counterbored mounting holes. All EBC brake discs fit standard 5-bolt hubs. All front rotors are 5mm thick, rear rotors are 6mm thick. Narrow band brake rotors, featuring a 38mm wide brake surface, are available for those individuals interested in saving weight. Can be used with Organic & Sintered brake pads. Note: Wide & Narrow band EBC rotors are compatible with stock brake pad size.