Some items from this specific schematic: O-ring,7.8x2.2, Screw,pan,5x25, Gasket,cylinder H (nas), Insulator,carbure.
Of all the components that make up this Cylinder Head (rear) the Screw Cross 5x8 has the lowest price.
On this parts fiche the Bolt,flange,7x55 is the most specified component.