The most reasonably priced component used on the Kaf620-c2 Mule2500 1991 Europe Gear Box is the Bolt-flanged,6x14.
This GEAR BOX assembly utilises fifteen Bolt-flanged,6x35(s) - the highest specified component.
Some items from this specific schematic: Plug-oil Drain, Bolt-flanged,6x35, Gasket, 10,5x16x1 (nas), Bearing-ball,#6007c3.