The Bolt,flange,6x8 is the cheapest item from this partsfiche.
Some items from this specific schematic: Spg-washer 10mm, Pin Split 2,0 X 22, Washer,plain,8mm, Stpr,chain Adj..
The Bush,rr.fork is the most widely applied product in the CB650 1981 (B) USA SWINGARM / CHAIN CASE ( two times ).