It is a separate part, at least for 03-06 (but would assume 07+ also). I've ordered it before, and installed it. While the original is spot-welded on, I secured mine via body panel adhesive (since I had 0 experience welding at the time). Unfortunately, I have forgotten what it was called but I got it from a dealer in 2016. Probably headlight support or something like that.
Edit: here's when I did that: My 3D-printed Lip Kit.