The bezel itself does not hold the monitor in place. Depending on the application it is just going to sit on top of it, ot be held down with a few screws.
Exactly how you mount your monitor depends on your cabinet and the angle at which you are going to mount it.
Straight up and down (or almost straight) is easiest., just make a sturdy shelf that goes from one side of the cabinet to the other, and then have the monitor sit on the shelf. Actually that is basically how I do it for any angle, but if it is tilted back more than a few degrees you will need four mounting bolts to secure the bottom of the frame to the shelf. You can also make a second "shelf" with a big hole in it to use those mounting holes that are in the front of the monitor as well.
REAL cabinets use all sorts of mounting schemes, shelves (Defender), metal brackets (Pac-Man), wooden board flush with the face of the monitor (Kangaroo), bolts through the side of the cabinet (Nintendo games), tube without frame mounted on wood (some mini cabinets). The shelf is the easiest way for doing it yourself though.
As for the bezel. Try calling all your local distributors and seeing if they have any in stock. They will want more than Happs, but at least you won't be paying crazy shipping.