The Cylinder Head assembly is constructed from several parts from which the Head,cylinder is the most expensive.
The most reasonably priced component used on the Cb550k3 Four General Export Mph Cylinder Head is the Screw,pan,5x20.
Some items from this specific schematic: Bolt,stud 6x32, Sparkplug (dr7es), Bolt,stud 6x40, Rubber,sealing.