The R1 Concepts Geo-Carbon drilled-and-slotted rotor is specified as a single replacement for the front-left wheel of 1997-2005 Buick Riviera applications. The description indicates a Geo-Carbon rotor with drilled and slotted surface treatment offered by R1 Concepts for that front-left position. This product overview restates the explicit fitment and presents the rotor as the front-left replacement for the Riviera models and years listed.
R1 97-05 Buick Riviera Front Left Drilled & Slotted Geo-Carbon Rotor