Beech are usually planted in wide pots but relatively shallow pots. Off the top of my head I would say they like a little depth to them, but I've seen exhibition photos of beech in very shallow pots.
production grade rectangle 13 x 9 x 3 inches, this shape would work, the color of the clay is wrong for beech.
old Japanese production grade - this may be excellent for a beech, but you can't have it, I got a ginkgo in it
Beigei - this is entirely too small for any but the smallest of beech, but if you could find a pot of similar shape and colors that was large enough, say 9 inches or more in length, this pot would look beautiful with any beech or maple in it.
If you can find a Clark Long pot, like this in a size large enough for a beech, even this could work. Though this particular pot is too small for beech, but there is no reason you need to stick to rectangular pots.