On this parts fiche the Gasket(6.2x13x1.2) (nas) is the most specified component.
The Washer is the cheapest item from this partsfiche.
A sample from the products for the Cam Chain include: Adjuster Assy,tensioner, Gasket(6.2x13x1.2) (nas), Bolt(6x25), Guide,cam Chain No.1.