The R1 Concepts drilled-and-slotted black brake rotor for 1980–1994 Ford F-350 4WD (excluding Super Duty), front left, is specified as the front-left replacement in the source. The listing calls out a drilled and slotted face with a black finish, indicating it is the designated front-left rotor for the stated F-350 4WD applications.
R1 80-94 Ford F-350 4WD (Excl Super Duty) Front Left Drilled & Slotted Black Brake Rotor