Ford Racing M-5538-A Rear Lower Control Arm Kit for Ford Mustang GT Standard equipment on 2007-2013 Shelby GT500, 2013 Mustang GT with Track Pack, and 2011-2013 Mustang GT with manual transmission Increases bushing durometer and stiffness for higher horsepower applications Includes hardware Note: Some factory fasteners are one-time use Reference service manuals for re-use & torque specification