On this parts fiche the Spring is the most specified component.
The component with the lowest price in the HEADLAMP (E2, E75) schematic is the Bulb(12v3.4w,stanley,a72a).
The twelve Gs450e 1984 (e) South Africa Belgium (e06 E21) Headlamp (e2, E75) component parts are all listed in this schematic.