The Gs400 1979 (n) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39) Fuel Tank consists of twenty-seven pieces with the Tank, Fuel being the most expensive.
Parts such as the Fuel Tank: Washer, Tank, Fuel, Bolt (8x30), Lock Washer are included in the Gs400 1979 (n) (e01 E02 E04 E17 E18 E21 E22 E24 E25 E30 E34 E39) Fuel Tank parts fiche.