The O-ring,2.5x1.5 is the cheapest item from this partsfiche.
sixteen components are shown in this Cb1000r 2009 (9) Australia Rear Brake Caliper(cb1000 R) exploded diagram.
Parts such as the Rear Brake Caliper(cb1000 R): Pin,hanger, Cap,bleeder, Seal Set,piston, Bolt,flange,8x25 are included in the Cb1000r 2009 (9) Australia Rear Brake Caliper(cb1000 R) parts fiche.