The R1 Concepts Geo-Carbon drilled-and-slotted rotor for 1998–2017 Freightliner M2 100/106 with hydro disc brakes is a rear left replacement for those model years. It features a drilled and slotted braking surface and Geo-Carbon construction, intended for rear left installation on compatible M2 trucks when renewing a worn rotor's braking surface.
R1 98-17 Freightliner M2 100/106 - Hydro Disc Brakes Rear Left Drill & Slot Geo-Carbon Rotor