The sub assemblies and components that make up this Valve(s) include this Arm-rocker, the most expensive part.
Some items from this specific schematic: Shaft-rocker, Valve-intake, Spring,rocker Arm, Arm-rocker.
The most reasonably priced component used on the Er500a4 Er5 2000 Europe Uk Fr Fg Is Nr Sp Valve(s) is the O Ring,16mm.