Your best bet is to just replace the head unit with anything that has one from best buy or wal-mart, etc.
1) Car is no longer technically stock
2) Large Unit is harder to replace
3) Cheaper to stay the same
1) Aftermarket head units are spiffy lookin
2) Have additional sound tuning features
3) Potential HD station access depending on unit
4) Build in Aux
5) Because of the difference in size, you get a new cubby hole type thing to keep stuff
6) Remote control!
Personal preference, but you may note quite a few advantages. That being said, you you don't want to part with the stock system I believe many electronics stores sell adapter kits in their car audio section.
A true aux input on a stock head unit is as much as buying a new head unit with an aux built in. Basic cd player to navigational dvd player can range from $80-$800+ with installation kits and wiring harness from crutchfield.
Your mustang radio needs to have a SAT button
and no satellite radio if that is the case you can use that free plug from behind the radio to input audio from any external source sat button aux interface
if you have a AUX button pie makes a interface call frd04-aux
if you don't have any of the 2 buttons i mention see if the radio have external cd changer controls
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