The R1 Concepts black drilled-and-slotted brake rotor for 2003–2006 BMW Z4 (rear left) is a vehicle-specific rotor featuring drilled and slotted braking surfaces and a black finish. Intended for the rear-left position on those Z4 model years, it provides a replacement rotor option to restore correct rotor fit and function for that axle.
R1 03-06 BMW Z4 Rear Left Drilled & Slotted Black Brake Rotor