The Camshaft/valve is made up of components including this Cam Shaft Comp,in which is the most expensive.
The lowest price component in this Camshaft/valve parts-list fiche is the Seat,valve Spg.
Some items from this specific schematic: Shim,tappet (1.65, Shim,tappet (1.90, Cotter,valve, Shim,tappet (1.92.