The sixteen Gl1500 Goldwing 1990 (l) Finland / Kph Oil Filter/water Pump component parts are all listed in this schematic.
The Bolt,flange,6x12 is the cheapest item from this partsfiche.
Some items from this specific schematic: Bolt,flange,6x95, Clamp,water Hose, Oil Filter Cartri, Pipe,water Inlet.