The R1 Concepts drilled black brake rotor for 2020–2021 Ford Mustang (left front) is a replacement rotor with a drilled braking surface and a black finish. Specified for the left front position on those Mustang model years, it’s intended to be used when replacing a worn or damaged front left rotor to restore correct rotor fit and finish.
R1 20-21 Ford Mustang Left Front Drilled Black Brake Rotor