Parts such as the Rear Arm: Collar (3l6), Bearing, Cylindrical(4pt), Collar(3yl), Nut, U (4pm) are included in the Xg250 2005 4d62 Greece 1d4d6-300e1 Rear Arm parts fiche.
On this parts fiche the Oil Seal is the most specified component.
The Yamaha REAR ARM has thirty products enlisted in the schematic.