i've been installing car audio for about 6 years, and yes there are 4 holes but you dont really need the correct tools to remove the radio, you can do it with two small screwdrivers one side at a time! after removing it, if you intend to replace with an aftermarket unit it is worth buying an ISO adapter (about £10) to convert the wiring from ford to standard ISO with out having to cut any wires, in doing this you will by able to re-install the original unit when you come to sell the vehicle
Mike Payter
May 2006