Parts such as the Valve: Valve, Intake, Valve, Exhaust, Spring, Valve Outer, Spring, Valve Inner are included in the Xv535 2000 4yhc Austria 104yh-300e1 Valve parts fiche.
On this parts fiche the Lock, Valve Spring is the most specified component.
The lowest price component in this Valve parts-list fiche is the Lock, Valve Spring.