Ok, well there are grilles on ebay but they are not real saleen grilles....
eBay Motors: F150 CUSTOM GRILL GRILLE 04 05 06 07 08 BLACK - SHARP! (item 230216899435 end time Feb-04-08 12:52:57 PST)
Also, there is something called a Cragar grille. Try to find one and it looks just like the Saleen