Hi everyone, I was able to obtain two of these and I've noticed that the bottom section of the 05 and is rounder.
For what I've seen drilling holes in the bumper doesnt appear to be enough and can cause the lip to not look flush as in the 03-04.

It looks like I will be modifying the lip by removing the mounting blocks/bolts in the back and leave the ones on the side. I did search around however didnt see much info or possibly did not search correctly.
I would like to see a more pictures of those who have done this as I prefer the look of the 05, the bumping part looks flusher/rounder than the 03-04 one.

Thank you.