Good luck! The wiring is suppose to be completely different, even to the mapping of the wires in the headset jack. I'm sure there will be an aftermarket harness addapter out at some point.
You can save money and get a quality Sony stereo that works off the handlebar controls just like a factory radio by contacting biketronics.com.I have one in my 05 FLHTI and it's awesome.
I put a biketronic in my 05 standard with a Sony marine grade radio. XM ready, plays mp3 etc. Easy install and works great. get hi proformance speakers.