The thirty-nine Gl1500i Goldwing Interstate 1992 (n) Usa California Oil Pump component parts are all listed in this schematic.
Some items from this specific schematic: Cover,oil Pump, Oil Seal,13x21x4, Dowel,pin,5x8, Washer, 6x2.3.
The Oil Pump assembly is constructed from several parts from which the Pump Assy,oil is the most expensive.