Parts such as the Oil Pump: Bolt,flange,6x22, Valve,relief, Rotor,outer, Body,oil Pump are included in the Gl1500 Goldwing 1990 (l) Belgium / Kph Oil Pump parts fiche.
The Honda OIL PUMP has thirty-five products enlisted in the schematic.
The lowest price component in this Oil Pump parts-list fiche is the Pin,split,3x25.