The lowest price component in this E-4 Camshaft Valve parts-list fiche is the Bolt,hex 6x12.
This E-4 Camshaft Valve diagram displays the required parts for the Cl450k4 U.s.a E-4 Camshaft Valve.
Some items from this specific schematic: Valve,exhaust, Retainer Valve, Bolt,hex 6x12, O Ring, 7.8x2.2.