Parts such as the Taillight: Brkt, 1 Black, License, Light, Nut, Bulb 12v 5w are included in the Ew50 2003 5wk1 England 1b5wk-300s1 Taillight parts fiche.
With two applications this Screw, Lens is the most specified part.
The component with the lowest price in the TAILLIGHT schematic is the Nut.