C/X Host to C/Con Concentrator Extension Cable?

Where can I find/buy the extension cable that goes between the C/X host card and C/Con concentrators? The connector appears to be a high-density form of a DB-15. There is zero information about this cable on the web site in either the C/X product information or the cabling FAQs, and no such cable in the Digi online store. C’mon Digi…

Cable pinout details and part numbers can be found here:

http://ftp.digi.com/support/techsupport/common/cables/async/cxindex.html