Buy the under-headlight 06-09 trim and just throw it on...there will be a slight flaw under the updated headlights (where the grille interfaces with the trim piece, but other than that, just throw one on...installs with the same screws as the 03-05 grilles...nothing to it...
**you'll notice on my avatar, there's a small space where the 05 grille meets witht he updated headlights...that eliminates when you get the same updated grille...otherwise, it's a minor flaw that doesn't show too much...