The R1 Concepts drilled-and-slotted black brake rotor for 1989–1990 Ford F-250 4WD (excluding Super Duty), front right, is presented as the front-right replacement in the source. The listing calls out a drilled and slotted surface and black finish, indicating it is the designated front-right rotor for those F-250 4WD applications.
R1 89-90 Ford F-250 4WD (Excl Super Duty) Front Right Drilled & Slotted Black Brake Rotor