Parts such as the Right Crankcase Cover: Bolt,flange,6x55, Nut,thin 6mm, Gasket, Crankcase (nas), O Ring 14x1.5 are included in the Z50j Monkey 1991 (m) Finland Mk Right Crankcase Cover parts fiche.
The most reasonably priced component used on the Z50j Monkey 1991 (m) Finland Mk Right Crankcase Cover is the Screw,cross 5x12.
On this parts fiche the Bolt,flange,sh,6x40 is the most specified component.