The R1 Concepts black drilled-and-slotted front-left brake rotor for 1972–1981 Subaru GL is offered as a single replacement rotor for the front left position across those years. The catalog text identifies the rotor as drilled & slotted with a black finish and specifies it for the front left fitment on the stated GL applications.
R1 72-81 Subaru GL Front Left Drilled & Slotted Black Brake Rotor