I got the mtec v3's from e92 lighting, and the heads and fogs from DDM. Do a google search they will pop right up
Daman, the rails are about 15 bucks each. I would get them before installing if I had to again, even thought the bumper sits flush and tight without.
The bumper rail sits behind the bumper on the left and right sides. They are held on by 2 torx head style bolts. Very simple to change. You have to pull the bumper away from these rails to get it off. There is a thread with pictures on here that I followed. Very simple.