As per my thread on my project I need 1 x CB500K exhaust clamp and 2 x CB550F/K exhaust clamps. Condition not important so long as they are still intact, no fins missing etc.
The difference between the 2 types is the back wall on the underside.
CB500K clamp
CB550F/K clamp, not 100 sure if the 550K is the same as the 550F but I assume it is.
Let me know if you can help and a cost inc P&P.
After checking on CMS it appears the CB550F/K use the same clamp but it has a 333 middle part number meaning it's off a CB400F model, never knew that. So I assume the 400 four clamp will be ok as well.