The dealer could/can add it to the 2005/2006, so I would hope they still have that option. I think you/they need the controller, new brake master cylinder, some wires etc,,,,.
Consider yourself lucky because the Ford IBC only works on electric and very limited number of electric over hydraulic brakes. I have EOH (Dexter) and they do not work well together (truck and trailer). I am installing a Tekonsha P3 because of this. Frustrating but use your savings to buy a P3.
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