The O-ring,boss is the lowest priced item on this Rear Wheel (pe250n) schematic.
thirty-five components are shown in this Pe250 1977 (b) Usa (e03) Rear Wheel (pe250n) exploded diagram.
With all the components that make up the PE250 1977 (B) USA (E03) REAR WHEEL (PE250N) assembly. The Screw is the most frequently specified with six applications.