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Yea....'06 is when they changed the 'look' of the truck, including taillgihts, emblems, and the big rear emblem was added.
I actually converted my '01 gate to look like a '06+ gate. Pulled off the stock Ford emblem, there's alignment holes, so i used '06+ fender emblems to cover them up. Then applied the Ford huge emblem in the center of the gate. Looks great imo. I call it a 'fake' '06+ tailgate. lol.