In this schematic the "Spring" is used most often.
Parts such as the Headlamp: Lens, Socket, Headlamp Assy, Lock Washer are included in the Gp125 1983 (d) (e02 E04 E17 E18 E21 E22 E41) Headlamp parts fiche.
The lowest price component in this Headlamp parts-list fiche is the Screw.