The most reasonably priced component used on the Gl1500 Goldwing 1988 (j) European Direct Sales / Kph Headlight (1) is the Screw,tap.,4x12.
The most expensive part in this assembly is the Light Semi Assy(h.
Some items from this specific schematic: Washer 6mm, Cover Rubber, Socket Comp.,r.fr, Bolt,flange,6x28.