On this parts fiche the Screw,flat,5x4.5 is the most specified component.
The Swing Arm/chain Case is made up of components including this Arm Assy.,swing which is the most expensive.
A sample from the products for the Swing Arm/chain Case include: Washer,thrust, Circlip In 35mm, Dust Seal,22x35x7, Needle Brg.