Parts such as the Crankcase: Bearing-ball,6307sh2-, Oil Seal,tb13225.5, Bolt-flanged-small, Guide,chain are included in the Kvf400-c1 Kvf4004x4 1999 Europe Uk As Crankcase parts fiche.
In this schematic the "Bolt-flanged-small" is used most often.
The Gasket (nas) is the cheapest item from this partsfiche.