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The R1 Concepts Geo-Carbon drilled-and-slotted rotor is a replacement for the front-left wheel of 2011-2016 Buick Regal models. The source describes a Geo-Carbon rotor with drilled and slotted braking surfaces from R1 Concepts, provided for the front left position. This overview matches the explicit Regal fitment and model years cited and presents the rotor as the front-left replacement for those applications.
R1 11-16 Buick Regal Front Left Drilled & Slotted Geo-Carbon Rotor
