Of all the components that make up this Rear Wheel the O-ring,61x2 has the lowest price.
A sample from the products for the Rear Wheel include: B/brg Rad N/com, Collar,rr Brake, Wheel Set,*nh196*, Flange Assy.,driv.
In this schematic the "Nut,u,flange,10mm" is used most often.