in the past 30 something minutes I have found some interesting things out there in .net land

ER11 C8 100L (ebay ref 170370225742) and ER11 16mm dia (ebay ref 110391685240) (only good for a few days until the time's up)

However I also found Specifications for these collets, which all you mechanical engineering types knew already.
Bottom line is that I can easily make use of either the 8mm dia or 16mm dia chucks and attach them to a DCBM.

Now ... off autocad land to make some drawings

John