Great looking belt! Wow!
As for the grommets, I found them in the sewing section of Wal-Mart. They're 1/4" antiqued brass, and come 15 to a pack. I wish I had a brand name for you, but I used up the last of them, and don't have a package available.
I used a hammer and leather punch to make the holes, and a grommet setter to finish them up.