The Front Fork (gs400n:f.no.71032~,gs400en:f.no.504510~) is made up of components including this Damper Assembly,right which is the most expensive.
This part-list fiche shows all the components that make up the Gs400e 1978 (c) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39 Front Fork (gs400n:f.no.71032~,gs400en:f.no.504510~) .