forget about waisting 20 bucks at a car audio store....you need a key ...at walmart they go for like 5 bucks but since its a ford you can make your own out of some wire there should be who holes on both sides of the stereo you push the wire in all four holes it pushes in on the clips and you just pull it right out
Go to Radio Shack and get a Removal tool ford stereos. It will look like two pieces of wire shaped in a U. Insert these into the small holes located on each side of the stereo until you feel a click. Put a little bit of sideways pressure and at the same time slightly pull the stereo out. Or you could just get a wire coat hanger and bend it to fit. Serves the same purpose.