The R1 Concepts drilled black brake rotor for the rear left of 2005–2014 Ford Mustang is a vehicle-specific rotor intended for the rear-left wheel location. The description calls out a drilled face and black finish for the rear-left application, identifying this part for brake maintenance or replacement on the listed Mustang model years to restore the braking surface.

R1 05-14 Ford Mustang Rear Left Drilled Black Brake Rotor