Nothing special about the bulb. You should be able to pick it up at a local parts store or just buy one online/ebay.

This DIY should help out but there are probably some more steps. I think the DRL bulb holder just twists out. Then R & R.

http://www.xoutpost.com/articles/x5/...placement.html

You can do a search. Also might want to checkout what's available at the top of the site (links). Like How Tos and Articles.

Good luck!