On this parts fiche the Bearing(25x33x30) is the most specified component.
The Pin 20x20 is the lowest priced item on this Rear Swinging Arm (gsx1100ez/ed/exd/esd) schematic.
The Rear Swinging Arm (gsx1100ez/ed/exd/esd) assembly is constructed from several parts from which the Swing Arm Assembly,rear is the most expensive.