Let's bump this thread up again and see if anyone may have come up with a solution. I spoke with Iron Cross concerning their Bluetooth installation to the stock HK radio and they told me it was not a cell phone interface. You can get a unit from J&M Audio but it is about $500 and change. The original 76408-06 unit is obsoleted by HD and not available anywhere. I managed to locate one at a Harley Dealership awhile ago but they wanted a ridiculous price (new MSRP) and they wouldn't budge. They knew they were not readily available and could ask pretty much what they wanted, take it or leave it. I am really amazed that, seeing the new bikes have come out with Bluetooth cell phone compatibility, (thereby pretty much eliminating the "you shouldn't be talking on your cell phone while riding" argument against the unit) that they haven't re-offered the old interface for us many riders with pre-2014 touring bikes, or, that some aftermarket company hasn't cloned the old interface. I'm telling you, I really liked that unit when I had my 07 Ultra and kick myself to this day for not taking it out when I swapped bikes.
I have a unit I can sell you for a reasonable price, Jim. You'd need to locate the antenna, and the wiring harness though.
Jim