hmmmm, I am confused. My sprockets fit my Asiatam drive shafts. It was a tight fit but with a little work they pressed right on. The retaining bolts are larger though. I don't understand the drilling and reaming comments. If you do either of these you will destroy the flat and the sprockets will be useless. The shafts will spin inside the sprocket instead of turning it.
Am I missing something?

Perry