if your dead set on having a set of fogs the same as the 2003's, just tear the front lip off ( double taped on I think), and you have a 2003 bumper. Then, get the fogs, and buy the windsplitter and your done. Only problem you might run into is maybe damaging the paint under the lip as you take it off.
Another thing. Since the lip makes the front look lower, by removing it you won't have that effect anymore. This may create an illusion where the rear spoiler will look even taller when looking at the car side on....I've seen this happen a few times.
For example, it's not uncommon to see someone stick a spoiler on a civic that seems to high. Then, later, they put a lower front bumper on, and then the spoiler don't look so bad anymore. I don'' think the lip is that much lower on the 2003.5, but the chance is there for the reverse effect to happen
Does that make sense?