Thats awesome. I looked everywhere for the 05 clips and I couldn't find them. I can never find what I'm looking for and when I stop looking they will turn up. Also, it's funny that you say the 99-03 clips will work. I have a set of those and I know exactly where they are.
Yeah I couldn't find the 05-07 clips either and then I found out why. Ford discontinued the original clips and have an alternative part number now for all the clips 99-07. I went out and checked my 99-03 clips and sure enough they fit the 05-07 header panel hole just fine and clip on the grille just like they do on the 99-03.