The Nut,hex.,8mm is the cheapest item from this partsfiche.
A sample from the products for the Swing Arm include: Boot,joint, Oil Seal 20x35x7, Cap,rr Fork Pivot, Pin Cotter 2.0mm.
The Nut,hex.,10mm is the most widely applied product in the CX500C CUSTOM 1982 (C) USA SWING ARM ( three times ).