The Washer-spring,18mm is the lowest priced item on this Rear Hubs/brakes schematic.
Of all the components used in this assembly the Bracket-comp-rear Sus is the most expensive.
With all the components that make up the KAF620-MEF MULE4010 2014 USA / 4X4 Rear Hubs/Brakes assembly. The Bolt is the most frequently specified with eight applications.