Parts such as the Oil Filter/water Pump: Clamp,water Hose, Washer,sealing,6., Bolt,flange,6x25, Oil Filter Cartri are included in the Gl1500 Goldwing 1989 (k) Switzerland / Kph Oil Filter/water Pump parts fiche.
The component with the lowest price in the OIL FILTER/WATER PUMP schematic is the Bolt,flange,6x12.
On this parts fiche the Pipe,water Inlet is the most specified component.