The lowest price component in this Rear Wheel (sh50dp/ds) parts-list fiche is the Bolt,hex.,8x16.
A sample from the products for the Rear Wheel (sh50dp/ds) include: Shoe Set,brake (nas), Seal,dust,22x32x3, Collar Rr.axle B, Arm,rr.brake.
In this schematic the "Spring Brake Shoe" is used most often.