Parts such as the Taillight: Washer, Plain, Bolt, Hexagon, Rear Reflector Ass, Washer, Plain are included in the Xg250 2005 4d62 Germany 1d4d6-300e1 Taillight parts fiche.
The Washer, Plain is the lowest priced item on this Taillight schematic.
With two applications this Screw, Tapping (25k) is the most specified part.