The most reasonably priced component used on the Z50j Monkey 1983 (d) Finland Rear Cushion is the Washer,10mm.
A sample from the products for the Rear Cushion include: Damper,rear, Spring,rr.cushion, Guide Rr Cushion, Nut,hex Cap.
Of all the components used in this assembly the Cushion Assy.,rr. is the most expensive.