The R1 Concepts drilled black brake rotor for the front left of 2011–2014 Ford Mustang is a vehicle-specific rotor intended for that wheel location. The description calls out a drilled face and black finish for the front-left application, identifying this part as the specified replacement when servicing or replacing the front-left brake on the listed Mustang model years.
R1 11-14 Ford Mustang Front Left Drilled Black Brake Rotor