Why would you need 4U's to remove the radio from a Protege 5. The text below was copied from the installation parts needed section of the forum. I think that 2U's would do it, one for each side.
"The radio removal tools are Ford radio remove keys. They are simply a set of U shaped metal. For a 2001 and up protege you will need 2 sets of tool, thats 4 U's"
"The radio removal tools are Ford radio remove keys. They are simply a set of U shaped metal. For a 2001 and up protege you will need 2 sets of tool, thats 4 U's"