The four Kaf620-r9f Mule4010 2009 Usa / Trans4x4 Wheels/tires component parts are all listed in this schematic.
The Wheels/tires assembly is constructed from several parts from which the Tire,23x11.00-10 4pr, is the most expensive.
The lowest price component in this Wheels/tires parts-list fiche is the Nut.