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You could check with Ford Parts & see if they have a "Theft Plug" for 2004 F150 Radio in Plug. When Radios are stolen & the Plug is cut off, Ford would use it instead of replacing complete wiring Harness.
Also, METRA Plug # XXXXX Plug should work.You could call METRA Tech at 1-800-221-0932 , #2 & ask. You may have to wait for them to answer