On this parts fiche the Washer is the most specified component.
The Gs400e 1978 (c) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39 Brake Hose consists of twelve pieces with the Hose,front Brake being the most expensive.
Some items from this specific schematic: Grommet, Hose,front Brake, Union, Hose,front Brake.