The thirteen Ksf250-a4 Mojave250 1990 Usa Front Hub component parts are all listed in this schematic.
Some items from this specific schematic: Collar,l=25, Hub,fr, Pin-cotter,4.0x30, Bearing-ball,60/222rs.
Of all the components that make up this Front Hub the Pin-cotter,4.0x30 has the lowest price.