The R1 Concepts Geo-Carbon drilled-and-slotted rotor is a single replacement intended for the rear-left wheel of 2006-2010 Buick LaCrosse models. The description identifies a Geo-Carbon rotor with drilled and slotted surfaces offered by R1 Concepts for the rear-left position. This listing corresponds to the LaCrosse fitment and years indicated in the source and presents the rotor as the rear-left replacement unit for that application.
R1 06-10 Buick Lacrosse Rear Left Drilled & Slotted Geo-Carbon Rotor