The Swing Arm assembly is constructed from several parts from which the Arm,swing is the most expensive.
Parts such as the Swing Arm: Bearing,r,4t30203e1, Screw-pan-cros, Shaft-swing Arm, Cover,swing Arm are included in the Kz1300a3 1981 Usa Canada Swing Arm parts fiche.
In this schematic the "Bolt,8x22" is used most often.