The drive coupler under the collar can be replaced if the rubber surround has worn off. The old coupler is left hand thread.
See here http://www.ebay.co.uk/itm/REPLACEMENT-KITCHENAID-BLENDER-DRIVE-COUPLER-GEAR-FOR-NEW-STYLE-BLENDERS-/111688372258?hash=item1a01255022
The cutters are part of the collar itself and not available as a separate part. If there is anything wrong with them you need to replace the whole collar. The collars are available on Amazon UK, K A Parts as well as other places.
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