The R1 Concepts drilled-and-slotted brake rotor for 2021–2025 Lexus RC300 (rear left) is described as a black-finished replacement specified for the rear-left position. The rotor is drilled and slotted per the description, with cross-drilled holes and surface slots and a black coating. It is intended for use as the rear-left brake rotor on the RC300 models cited.
R1 21-25 Lexus RC300 Rear Left Drilled & Slotted Black Brake Rotor