The most reasonably priced component used on the Gl1500 Goldwing 1989 (k) European Direct Sales / Kph Trunk Light/license Light is the Screw,cross 5x12.
Some items from this specific schematic: Bulb (12v5w), Bulb 12v21w, Screw,tap,4x20, Screw Tapp 5x16.
With four applications this Nut Special is the most specified part.