The Screw is the cheapest item from this partsfiche.
A sample from the products for the Headlamp (gs1100ez/ed) include: Bulb(12v60/55w,h4), Cover,headlamp Socket, Ring,mounting, Washer.
sixteen components are listed in the schematic for this Gs1100es 1982 (z) Usa (e03) Headlamp (gs1100ez/ed) .