The R1 Concepts black drilled-and-slotted front-left brake rotor for 2015–2019 Subaru Legacy is a single rotor specified for the left front position and those model years. The description identifies this unit by its drilled & slotted face and black finish and indicates it is intended for the front left wheel on the listed Legacy applications.
R1 15-19 Subaru Legacy Front Left Drilled & Slotted Black Brake Rotor