The R1 Concepts drilled black brake rotor for rear left Porsche 911 (1999–2021) is supplied as the replacement rotor for that wheel position over the listed years. The catalog text describes a drilled rotor face and a black finish. Fitment is explicit to the rear left position for 1999–2021 Porsche 911 models, allowing buyers to confirm side and year compatibility.

R1 99-21 Porsche 911 Rear Left Drilled Black Brake Rotor