The Crankshaft/balancer ('80 A1) is made up of components including this Crankshaft Assy which is the most expensive.
The Screw-pan Head,6x8 is the cheapest item from this partsfiche.
Some items from this specific schematic: Shaft Idler,balancer, Spacer,20.3x40x1, Pin-spring,4x8, Chain Balancer.