Hmm, this is an old thread, so I'm sure you just measured by now. However, I will add that I installed a 22" in my ST31QB. I had to move the mount for the TV up a couple inches, as the TV hung too low to fit in the enclosure. All it took was 5 minutes, and drilling 1 hole. (moved it up so that the bottom screw is now in the original hole for the top screw, and I drilled a new hole for the top screw)
Now it is a perfect fit.
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