This Case-air Filter is the most expensive of the items that make up this Air Cleaner assembly.
Some items from this specific schematic: Seal,air Filter, Washer-plain-small,6m, Screw-pan Head,6x14, Tube.
The most reasonably priced component used on the Kaf300-b2 Mule500 1991 Usa Air Cleaner is the Nut,6mm.