The nine Gp125 1978 (c) (e01 E02 E04 E06 E13 E17 E18 E21 E22 E24 E30) Turn Signal Lamp (e17, E21) component parts are all listed in this schematic.
With a quantity of eight pieces, the Screw is the most used part in the TURN SIGNAL LAMP (E17, E21) diagram.
The Gp125 1978 (c) (e01 E02 E04 E06 E13 E17 E18 E21 E22 E24 E30) Turn Signal Lamp (e17, E21) consists of nine pieces with the Lamp, Rear Turn Signal being the most expensive.