Some items from this specific schematic: Rubber,mount, Gasket,head Cover (nas), Washer,sealing,6., Seal Valve Stem.
twelve components are shown in this Cb500s 1998 (w) Germany / 50p Gasket Kit A exploded diagram.
The Gasket Kit A assembly is constructed from several parts from which the Gasket Kit,a (nas) is the most expensive.