These are great quality replacement pumps. The stamped impeller is light (less load on the bearings), and was designed to move the same volume of water as the factory pump with larger fin areas. Includes gasket & studs to attach the fan clutch. Install Note: For all early Z Water Pumps, do not overtighten the belt! There should be 3/4" to 1" of deflection. Tight belts will prematurely wear out Water Pump Bearings!