The twenty-three Z50j2 Monkey Japan Right Crankcase Cover component parts are all listed in this schematic.
Some items from this specific schematic: Plate, Lifter, Pin,dowel,8x12, Bolt,flange,6x55, Oil Seal,13.8x24x.
The most reasonably priced component used on the Z50j2 Monkey Japan Right Crankcase Cover is the Screw,cross 5x12.