Parts such as the Turn Signal Lamp: Bolt, Screw 6x12, Lens, Bracket,rear Turn Signal are included in the Ts250er 1980 (t) (01 02 E04 E09 E16 E17 E18 E21 E22 E24 E30 E39) Turn Signal Lamp parts fiche.
The component with the lowest price in the TURN SIGNAL LAMP schematic is the Gasket (nas).
On this parts fiche the Screw Tapp. is the most specified component.