Maintain your Chevrolet, Buick, GMC, or Cadillac vehicle with a Genuine GM Parts Suspension Control Arm. This control arm connects the steering knuckle to the vehicle's frame, and allows the suspension to move, keeping the vertical motion of your vehicle's wheels synchronized in relation to its body. Only Genuine GM Parts are tested to meet GM Original Equipment standards and are designed specifically to fit your vehicle. ? WARNING: Cancer and Reproductive Harm