The Rear Cushion assembly is constructed from several parts from which the Spring,rr.cushion is the most expensive.
Parts such as the Rear Cushion: Collar,rub.bush, Cushion Assy,rear (jdm), Stopper,spring Se, Bolt,flange,10x35 are included in the Nas750m Rc39 Japanese Domestic Rear Cushion parts fiche.