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The R1 Concepts drilled black brake rotor for 2009–2011 Cadillac STS (front left) is presented as a replacement driver-side front rotor. The product description highlights a drilled face and a black finish and explicitly lists fitment for Cadillac STS models covering 2009 through 2011 at the front-left position.
R1 09-11 Cadillac STS Front Left Drilled Black Brake Rotor
