In this schematic the "Cap,dust Seal" is used most often.
Parts such as the Swingarm/chain Case: Bolt,flange 6x28, Bolt,flange,dr.6x, Nut,u.,6mm, Joint Lj-fz,drive are included in the Crf230f 2005 (5) Australia Swingarm/chain Case parts fiche.
The Collar,chain Slip is the lowest priced item on this Swingarm/chain Case schematic.