This is a A-155035A Voltage Regulator (12 Volt) PN: 155035AMain Description As Following : A-155035A Voltage Regulator (12 Volt) P.N: 155035A Replaces: Delco# 1118792 Stocked As: A-21A614 Found in Section & Models : Ignition & Electrical Parts > Ignition & Related Parts, White/ Oliver/ Mpl Moline TRACTOR: 550 (SN 60501-117378) Associated Items : New Also This is An Aftermarket Product And : Replaces: Delco# 1118792