In this schematic the "Bearing-ball" is used most often.
A sample from the products for the Front Hub include: Collar,fr Axle,l=24, Circlip,42mm, Seal-oil,mh20354.5, Wheel-assy,fr,g.gray.
The lowest price component in this Front Hub parts-list fiche is the Circlip-type-c,35mm.