On this parts fiche the Bolt,sprocket Fitting is the most specified component.
Parts such as the Camshaft/chain/tensioner: Tensioner,cam Chain, Washer,18.3x24x1.4, Bolt,allen,6x18, O Ring,21mm are included in the Kz550h2 Gpz 1983 Usa Canada Camshaft/chain/tensioner parts fiche.
The Camshaft/chain/tensioner is made up of components including this Camshaft-valve which is the most expensive.