I am guessing you have the squarish looking recesses. So the factory would not fit all that well and the 04 05 square i do not think will fit perfectly well either. Aftermarket would probably be your best bet. But it is hard to find one that will look good in that spot. Upgrading to an EDGE or 4x4 valance would be a direct swap and you can get the fogs in those perfectly.
Sold:2004 XLT 4x2 Ext. Cab. 3.0 Mods: 3" spindle, AAL, shackle, 32x11.5 on 15x8s, billet grille, clear corners, flow 40 dumped, line-x, CB/PA, traction bars, lil sound system, auto up down windows
Sold:2005 XLT 4x4 Ext. Cab. 4.0 Mods: ProComp lights w/ HID swap on tabs, 32x11.5 on 15x8s, CB/PA, black out heads/corners, lil sound system, cranked t-bars, flow 40 dumped, line-x, shell, bed rug, 06+ tails, metal tail gate handle since plastic one shattered, OHC, Mustang Dome.