This CYLINDER HEAD COVER assembly utilises four Bolt,flange,6x20(s) - the highest specified component.
The most reasonably priced component used on the Xr500 1979 (z) Usa Cylinder Head Cover is the Bolt,flange,6x20.
Parts such as the Cylinder Head Cover: Pin,dowel,5x28, Bolt,flange,6x50, Receiver,decomp, Bolt,flange,6x45 are included in the Xr500 1979 (z) Usa Cylinder Head Cover parts fiche.