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FX4 adds: Body-color front and rear bumpers (with monotone paint) or Dark Shadow Grey front and rear bumpers (with two-tone paint), black "bar style" grille insert, wheel-lip moldings, black leather-wrapped steering wheel, black rubber off-road floor mats, overhead storage system (SuperCab and SuperCrew) and sport cloth seats.
There was also the following thread from not too long ago...although it is for a 2008 model year, the FX4 package appears to be pretty similar between '05 and '08. https://www.ford-trucks.com/forums/6...4-version.html