Buy one get one. Purchase (1) seal and we ship you two seals. Sometimes it is easy to mess up a seal or gasket, so we are sending you a back up. This Metal cased double lip seal is the best way to stop oil leaks on that cone motor. Fits 1970-1984 1200 and 1340 Shovelhead motors and 1984 – 1999 1340 Evolution motors. Plus most S&S Cycle, Jim’s and RevTech single cam motors. These came from the now closed Viper Motorcycle company and were also used in the monster 152 inch Ilmor Billet Engine. Viper part number VMC-A2042 and Harley Davidson part number 83162-51. Two seals with free shipping!