On this parts fiche the Spring,head La is the most specified component.
nineteen components are listed in the schematic for this Gs400e 1978 (c) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39 Special Market (e34) .
The Screw is the cheapest item from this partsfiche.