The last time I checked the factory ones were kind of expensive.
You could get a blitzsafe adaptor that will plug in to the back your existing head unit and will provide a port to plug in a wider range of CD changers.
In addition, it provides 2 RCA jacks that will let you listen to an additional device like an MP3 player.
http://logjamelectronics.com/landroveraux.html
Peace,
Dan
