I bought the Parrot CK3300 bluetooth hands free kit to work with my Treo 650 (and wife's LG PM-325). I wanted to install it in my 2004 Ford Eddie Bauer Expedition. The real trick was getting it integrated the "official" way with the factory in-dash 6 disc changer. After a lot of research I ordered a "Ford Hands Free Prep Harness" part number AL2Z-19A393-AA. It ended up working perfectly. Made it very easy to wire up. When I use the phone, the stereo automatically mutes and "PHONE" is displayed on the display. My steering wheel volume controls work during the call to control the volume.

This is the "Ford Hands Free Prep Harness" I used:


Here are some pics of the installed CK3300: