Rebuild the tappets on your 1953-1984 big twin engine to return good tappet bodies to service. S&S Tappet rollers fit 1929-1956 Side Valve big twin motors, 1936-1984 OHV big twins and 1957-1985 Ironhead Sportster® models. Set includes four precision tappet rollers with bearings and four tappet axles to rejuvenate tappets with worn or damaged tappet rollers.