The most reasonably priced component used on the Xrv750 Africa Twin 1992 (n) Germany Transmission is the Bolt,flang,6x16.
Some items from this specific schematic: Gear,m-5, Washer,spline 28m, Bolt,flang,6x16, B/brg Rad N/com.
On this parts fiche the Washer Spline 28x is the most specified component.