Wiper Motor Conversion Kits #36-4065, #36-4066 and #36-4068 replace the original vacuum powered unit with a 2 speed electric motor. #36-4065 and #36-4066 work on both 6 and 12 volt trucks. Wiper Motor Kit #36-4067 is a 2 speed electric replacement motor for 1955-57 2nd series trucks originally equipped with an electric motor only. (Not for use on vacuum equipped models.)