As far as I know....
-the OEM lights are different. The 05+ lights are round.
-on my 06, there are covers where the fogs would be, seeing as I have none (but I'll be fixing that up myself soon enough). A bezel would be required.
-I really don't know on that one. Although my best advice to you is to read the "how-to" information archive that is on here. I have the LINK
for you here, it'll probably answer about 80% of all your questions. ....and it's a safeguard in case I'm not 100% correct on the information:)
...and Welcome to Focus Fanatics!