The R1 Concepts black drilled-and-slotted front-right brake rotor for 1980–1983 Subaru GL is listed as a single replacement rotor for the front right wheel and the specified years. The product is identified in the source as drilled & slotted with a black finish and designated for the front right fitment on the named GL applications.
R1 80-83 Subaru GL Front Right Drilled & Slotted Black Brake Rotor