Can anyone tell me the difference between a regular F150 to a f150 FX4. I am also wondering where the best place to get an ownersmanual and floor mats for 2004 FX4?

 

From the brochure:
The high-powered option for 4X4 enthusiasts, off the road and on the highway.
In addition to the standard features on every F-150, listed below are a few
found on FX4 in addition to those provided with XLT.
• Off-road tuned shocks
• Optional captain's chairs with flow-through center console and floorshifter
• Optional 18" machined cast aluminum wheels
• Black leather-wrapped steering wheel
• Skid plates and limited slip axle

Here's a pdf of your owner's manual: http://www.motorcraftservice.com/?link=002&urlfile=/pubs/content/~WO4F12/~MUS~LEN/36/04f12og5e.pdf

I just ordered OEM floormats from the dealer, depends what kind you want. A lot of guys run the Weathertechs for rubber mats.