On this parts fiche the Bolt,flange,6x30 is the most specified component.
This schematic depicts all components used in the Xrv750 Africa Twin 1990 (l) France / Yb Cylinder Head Cover partslist.
A sample from the products for the Cylinder Head Cover include: Cover Comp.,cylin, Rubber, Mount, Cap,tap.adj.hole, O-ring 44x3.