On this parts fiche the Bolt,flange,6x25 is the most specified component.
A sample from the products for the Right Crankcase Cover include: Pin,spg. 3x10, Receiver,cable, Dowel,pin,10x16, Screw,tap 6x16.
This Right Crankcase Cover diagram displays the required parts for the Cb250rs 1980 (a) England Right Crankcase Cover.