Hi Simon,
Thanks for your question, We do sell a 71 pce accessory pack v2543 Which contains 2 collets
I have never known a collet to wear as once the collet nut is tightened there is no relative wear taking place.
Are you sure it’s the collet and not the collet chuck that is worn?
Please contact us at Contact@dktools.com if you have any further questions.