The 20 Rear Arm assembly is constructed from several parts from which the Rr Arm Comp is the most expensive.
Parts such as the 20 Rear Arm: Collar 802823130000, Bolt, Flange(4jh), Collar, Bolt, Flange(4jh) are included in the Mt125a 2015 5d7m Europe 1p5d7-300eu 20 Rear Arm parts fiche.
The Bolt, Flange is the lowest priced item on this 20 Rear Arm schematic.