The Washer, Spring is the cheapest item from this partsfiche.
The Oil Tank is made up of components including this Oil Tank Assy which is the most expensive.
Parts such as the Oil Tank: Oil Tank Assy, Gasket 214217720000 (nas), Hose (129-24311-00), Clip 101235600 are included in the Ty50 1978 1f5 Europe 271f4-300e1 Oil Tank parts fiche.