The Ring,snap is the cheapest item from this partsfiche.
Some items from this specific schematic: Sleeve,tachometer Drive Gear, Seal,oil(5x12x8), Head Assembly,cylinder, Head,cylinder.
With all the components that make up the GS850GL 1982 (Z) USA (E03) CYLINDER HEAD assembly. The Bolt(6x39) is the most frequently specified with sixteen applications.