Edit: Added angled brackets as well as feet.
video of them installed: http://www.youtube.com/watch?v=wBTLpYWn8cA
These brackets need:
6x 742mm long, 1/4" rod
36x M3 nuts
36x M3 x 25 socket cap screws
36x M3 x 10 socket cap screws
36x M3 washers
The main reason for these is to guard the soft aluminum track and belts. They have the added benefit of adding a little rigidity to the printer.
The nuts go on the inside, you have to tighten the set screw all the way without the rod in so the nuts squish in place.