The component with the lowest price in the TAIL LAMP schematic is the Bolt,6x16.
Parts such as the Tail Lamp: Lens,tail Lamp, Screw,tapping,4x25, Gasket,tail Lamp (nas), Body-comp-tail Lamp are included in the Ar80c3 1985 Usa / Mph Tail Lamp parts fiche.
Of all the components used in this assembly the Lamp-tail is the most expensive.