Parts such as the Taillight: Nut,flange,6mm, Clamp,rr.comb., Bulb,tail Light, Cord.comp.tail/lt are included in the Nh80md Aero 80 1983 (d) Usa Taillight parts fiche.
The component with the lowest price in the TAILLIGHT schematic is the Screw,tap.4x30.
Of all the components used in this assembly the Taillight Assy. is the most expensive.