Parts such as the Rear Brake: Boot 2, Bolt, Disk, Rear Brake 2, Shim, Caliper are included in the Xg250 2005 4d61 Austria 1d4d6-300e1 Rear Brake parts fiche.
With three applications this Screw(3gd) is the most specified part.
The component with the lowest price in the REAR BRAKE schematic is the Bolt, Button.