A sample from the products for the Air Cleaner include: Baffle Plate,air Filt, Fitting,tube, Duct,air Filter,#2&3, Washer-plain,6mm.
The most reasonably priced component used on the Kz650b2 1978 Usa Canada / Mph Kph Air Cleaner is the Washer-plain,6mm.
With six applications this Clamp,tube is the most specified part.