The most reasonably priced component used on the Gp125u 1981 (x) Sweden Greece (e17 E41) Headlamp is the Screw.
The sub assemblies and components that make up this Headlamp include this Headlamp Assy, the most expensive part.
Some items from this specific schematic: Reflector, Gasket (nas), Lock Washer, Bulb(6v25/25w,stanley,a7007).