The lowest price component in this Cam Chain parts-list fiche is the Screw.
Parts such as the Cam Chain: Bolt, Chain,camshaft Drive(120l), Idler,cam Chain, Nut 6mm are included in the Gs850g 1985 (f) (e01 E02 E04 E06 E22 E24 E25) Cam Chain parts fiche.
The Cam Chain is made up of components including this Tensioner,cam Chain which is the most expensive.