The R1 Concepts drilled-and-slotted black brake rotor is specified as a replacement front-left rotor for Workhorse applications. Described as drilled & slotted with a black finish, it matches catalog detail and serves as a serviceable rotor for the front brake assembly. Fitment is explicit: for Workhorse 500Lb GVW applications from 2006–2012 in the front-left position.
R1 06-12 Workhorse 500Lb Gvw) Front Left Drilled & Slotted Black Brake Rotor