ACDelco GM Genuine Parts clutch master cylinders are designed, engineered and tested to rigorous standards, and are backed by General Motors. These true OE parts are specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle, promising the correct fit, an easier install, and the expected performance. For optimal operation, safety, and confidence on the road, service your GM with the parts it came with—ACDelco clutch master cylinders.