The R1 Concepts drilled-and-slotted black brake rotor is specified as a replacement front-right rotor for a Workhorse medium-duty series listed in the catalog. It’s described as drilled & slotted with a black finish and intended to function as a serviceable rotor for the front brake assembly. Fitment is explicit: for the listed Workhorse series from 2006–2012 in the front-right position.
R1 06-12 Workhorse 000Lb Gvw) Front Right Drilled & Slotted Black Brake Rotor