The lowest price component in this Front Balancer parts-list fiche is the Cir Clip,ex.20.
Some items from this specific schematic: Cir Clip,ex.20, Flange,bal.holder, Needle Brg, Slipper,bal,chain.
This Front Balancer diagram displays the required parts for the Xl500s 1981 (b) Usa Front Balancer.