The most reasonably priced component used on the Nsr125r 1991 (m) Italy / Kph Right Crankcase Cover is the Bolt,flange,6x35.
Some items from this specific schematic: Oil Seal 12x18x3, Gasket,r Cover (mca), Bolt,flange,6x55, Cover Comp,r Cran.
This RIGHT CRANKCASE COVER assembly utilises six Bolt,flange,6x32(s) - the highest specified component.