The question you ask is too involved for a proper answer. You need to go to a car parts store, and get a repair manual for your car. They cost about $16.00 Or, go to a Public Library.
Ford radios typically use the u-shaped tools to remove the radio - Just a few $$ at Autozone or most any parts store (*DON'T use Ebay! They're waaaay over-priced!)
Don't be surprised to find 2 wiring harness'es plus the antenna - find and hit the harness 'release' lever to disconnect - just gently pull the antenna straight out.
There are numerous sources for wiring harness 'converters' that will plug into the car connectors and provide easy connection then to whatever radio you purchase.
I highly recommend, and do others around the 'Farm' Crutchfield.com - they'll let you know everything you need to know about replacement units - very competitively priced - wide range of products - and usually include the tools and harness converters either at NO CHARGE, or very reasonable costs.
avent got a c lue
Why don't you ask a mechanic?
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Buy a repair manual at NAPA, or AutoZone, or Wal*Mart.
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The first was 2000.