The lowest price component in this Headlamp parts-list fiche is the Screw.
The twenty-five Gs1000h 1980 (t) (e01 E02 E04 E17 E18 E21 E22 E24 E34) Headlamp component parts are all listed in this schematic.
Some items from this specific schematic: Ring,headlamp Unit, Nut,adjusting, Screw, Bulb(12v60/55w,h4).