Check out any of the twenty-five Turn Signal Lamp components enlisted.
The component with the lowest price in the TURN SIGNAL LAMP schematic is the Screw.
Parts such as the Turn Signal Lamp: Cushion, Lock Washer, Cushion, Nut are included in the Gs400 1979 (n) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39) Turn Signal Lamp parts fiche.