Check out any of the twenty Upper Crankcase Cover components enlisted.
Parts such as the Upper Crankcase Cover: Nut,hex 8mm, Pin Cotter 2.0mm, Nut,hex 8mm, O-ring,21.5x3.2 are included in the Cl72 Scrambler 1962 Usa / 250 Upper Crankcase Cover parts fiche.
With a quantity of two pieces, the O Ring,21.5m/m is the most used part in the UPPER CRANKCASE COVER diagram.