The R1 Concepts black drilled-and-slotted rear-right brake rotor for 2012–2023 Subaru XV Crosstrek is offered as a single replacement rotor for that side and application. The product is described as drilled & slotted with a black finish and provided for the rear right position to match the vehicle fitment shown in the source.
R1 12-23 Subaru XV Crosstrek Rear Right Drilled & Slotted Black Brake Rotor