The component with the lowest price in the CYLINDER HEAD COVER schematic is the Bolt Flang 6x20.
Some items from this specific schematic: O-ring 62.4x2.5, Cover,rr.cylinder, Rubber, Mount, Bolt Flang 6x20.
This CYLINDER HEAD COVER assembly utilises four Bolt,flange,6x30(s) - the highest specified component.