you should research din removal tools or the coat hangar trick at http://www.i-hacked.com/content/view/213/45/
asides from that you will need a wiring harness for the aftermarket head unit
if you are trying to install the factory stereo to it...it should be the same plug...if you are trying to install the stereo for a cougar on a different car you need to buy the plug for that stereo and then a harness for the other car...
I find that by going to www.crutchfield.com they have a lot of advice. I just installed a car stereo in my 1993 courgar and you need a special factory radio removal tool that has 4 prongs that will remove the radio. Then, you need to install the new radio as per directions. Additional mounting brackets may be needed.
If it's anything like the Cougar LS, there should be 4 holes in the factory stereo. There is a U shaped removal tool that you can get (they come in pairs). They will have instruction on how to pull the stereo on them. If you don't want to be bothered to do this yourself, just have the place you got the new radio from install it for you. Should cost an extra $100 or so.
2002
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Try the,Install Doctors at www.installdr.com. Good site for finding stereo wiring diagrams. Hope this helps. Good luck
buy a wire harrnes install kit they will have collored wires that will match the line up of your aftermarket car stereo. and then you don't have to cut any of the factury wires. if you go to sell the car you can put the facutery stereo back in
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Check with Crutchfield.com. They can provide step by step diagrams of how to install your new stereo.