Parts such as the Rear Cushion: Cushion Assy., Rr., Nut, Flang, 10mm, Bolt Flange 10x45, Washer,plain,10mm are included in the Trx500fe 2010 (a) European Direct Sales / Ec Rear Cushion parts fiche.
The Rear Cushion assembly is constructed from several parts from which the Cushion Assy,rr is the most expensive.