I think you are over thinking this. You are not replacing the starter solenoid. All you are doing is by passing the start circuit from the ignition switch to the solenoid on the starter. You can do that with either the Ford unit, a Chrysler starter relay or an after market relay depending on how you wire it. The Ford unit just eliminates the purple wire to the terminal on the starter. Using either of the other two ways you still need that wire but now it runs from the relay not the starter switch.
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