The Collet,retainer is the cheapest item from this partsfiche.
Parts such as the Valve: Shim,t=3.00, Spring,valve,inner, Shim,t=2.05, Shim,t=2.55 are included in the Zx750a2 1984 Europe Uk Fr Gr It Nr Sd Valve parts fiche.
The sub assemblies and components that make up this Valve include this Valve-exhaust, the most expensive part.