The R1 Concepts Geo-Carbon drilled-and-slotted rotor is a single replacement intended for the front-left wheel of 1983-1996 Buick Century applications. The product description lists a Geo-Carbon rotor with drilled and slotted surfaces offered by R1 Concepts for that front-left position. This overview mirrors the stated fitment and presents the rotor as the front left unit corresponding to the Century models and years indicated in the source text.
R1 83-96 Buick Century Front Left Drilled & Slotted Geo-Carbon Rotor