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The R1 Concepts drilled-and-slotted black brake rotor is cataloged as a replacement rear-left rotor for Workhorse applications. It’s described as drilled & slotted with a black finish and intended to function as a serviceable rotor for the rear brake assembly. Fitment is explicit: for Workhorse 500Lb GVW applications from 1989–2022 in the rear-left position, provided to meet factory mounting points.
R1 89-22 Workhorse 500Lb Gvw) Rear Left Drilled & Slotted Black Brake Rotor
