Parts such as the Cylinder Head: Shaft-comp,decomp, Bolt,flanged-small,10, Washer-thrust,25mm, Holder-carburetor are included in the Klx450acf 2012 Europe Cylinder Head parts fiche.
The Bolt-socket,6x12 is the lowest priced item on this Cylinder Head schematic.
The most expensive part in this assembly is the Head-comp-cylinder.