Hi Guys

Im having a bit of trouble locating the number for the rear sprocket parts.
I really want to get a spare set of the threaded flange tubes that go in to the cush drive from the sprocket.
At the moment I keep having to remove them from one sprocket to another when i adjust my gearing for the track I'm at.
The parts list does not show the item as a separate part.
Is it a case of buying a new OEM sprocket for cannibalism of the parts required ?
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It smokes a lot is that right !