Parts such as the Master Cylinder: Packing (nas), Boot, Diaphragm, Bolt-flanged are included in the Kaf620-b4 Mule2520 1998 Usa, Canada Master Cylinder parts fiche.
In this schematic the "Washer,10.5x15x1.5" is used most often.
This schematic depicts all components used in the Kaf620-b4 Mule2520 1998 Usa, Canada Master Cylinder partslist.