Aluminum Rotor Oil Cap - Chrome/Black - 55mm by Rotary13B1 Design: Rotor Finish: Chrome Plated / Black Enamel Rotor Size: 55mm wide, 17mm thick Fits: ALL RX-7s Engine oil filler necks. 93 and Below. Old Schools. S1 RX-8 DOES NOT FIT S2 RX-8