Teardown Lab - Ultimate Chrysler Jeep Bluetooth Radio Hack
Want to make your own Bluetooth hands-free interface? you can, its easy. Don't waste money on expensive kits, just build your own!
As you can see this is for a radio that did not even support a wired Aux connection, using the same technique you can add a wired or BT audio hookup to any radio with an optical drive.
Look for the MBC05-CAR-AT module and you can make as many as you like!