Parts such as the Cam Chain - Tensioner: Bolt,flange,6x28, Nut,hex 20mm, Bolt,tensio Lock, Spring,tensioner are included in the Cx500 1978 Germany 27ps Type Cam Chain - Tensioner parts fiche.
Of all the components used in this assembly the Guide,cam Chain is the most expensive.
The Pin,lock 6mm is the cheapest item from this partsfiche.