Fits: 1999-'17 HD® big twins and 2000-'18 HD® Sportster® and 2017-18 M8 models. Features and Benefits: Reduced valve train noise from start up to shut down. Close tolerances for low leak down rates - fast pump up and superior high rpm performance. Low mass, bearing grade, silicon nitride check ball and lighter check ball spring - enhances fast pump up and quiet operation. 100% tested to ensure that leak down and top end oil flow are within specification. Includes HL2T kit.