Is there a way to retro fit the mp3/headphone jack that comes fitted to later models?

Taa

yeah if you take out your system in your car and go to your local ford dealer and get a mp3 cable/aux cable and it plugs into the rear and you can put the cable through the dash or bottom part near the hand brake like the norm or through the drawer at front passenget side. easy mod to your car mail me if ya need help. check ebay too cosi seen some floating on ther sometimes

Thank,
Does it have a unique connection that goes in to the back of the headunit? or is it just a simple 3.5mm head phone jack?