The component with the lowest price in the SWINGARM schematic is the Washer-plain-small,14.
Parts such as the Swingarm: Circlip-type-c,38mm, Bolt-flanged, Washer-plain-small,14, Nut,flanged,10mm are included in the Kaf300-c1 Mule550 1997 Usa Swingarm parts fiche.
Check out any of the sixteen Swingarm components enlisted.