In this schematic the "Spring Brake Shoe" is used most often.
A sample from the products for the Rear Wheel include: Tube,tire(micheli, Bolt,flg Dr 8x32, Indicator,rr.brak, Brg,ball Radial 6.
The most reasonably priced component used on the Sh100 Scoopy 1999 (x) Italy Rear Wheel is the Joint, Brake Arm.