Check out any of the twenty-eight B-19 Rear Brake Drum components enlisted.
Some items from this specific schematic: Spindle,rr.wheel, Bolt,hex.,10x22, O-ring,41.5x2.8, Holder,pin Split.
The lowest price component in this B-19 Rear Brake Drum parts-list fiche is the Pin Cotter 4.0mm.