Can anyone help me with my stereo change im wanting to add a stereo with a AUX port not sure if you can add it to the default stereo which is the 4500 model picture below:

http://www.google.co.uk/imgres?imgurl=http://static.flickr.com/25/38534028_34fb392764_m.jpg&imgrefurl=http://www.mp3car.com/car-audio/79621-how-to-remove-a-ford-4500-radio.html&usg=__8dRJ-NJ-ReoSaMfkHDmfhHW1GTo=&h=180&w=240&sz=11&hl=en&start=0&zoom=1&tbnid=Qyo-9s5K7vJcZM:&tbnh=144&tbnw=192&ei=uywnToW6KMmb8QO-3JnkCg&prev=/search%3Fq%3Dford%2Bfiesta%2B4500%2Bstereo%26um%3D1%26hl%3Den%26biw%3D1024%26bih%3D605%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=353&vpy=131&dur=913&hovh=144&hovw=192&tx=122&ty=65&page=1&ndsp=12&ved=1t:429,r:1,s:0

If this can't be done how would i go by removing the stereo all together and adding a new one?

Any posts will be grateful!