I know you asked this a couple of months ago, but if you're still looking, the only mount adapter I could find for this was from a guy in Canada named Gladiator Joe. He has a webpage though I used his ebay portal. He had 100% rating on nearly 800 orders. I finally got around to ordering it today, I'll find out in a week or two if it works well. With shipping to the US and all it was 33.99 total.http://www.ebay.com/itm/Vesa-mount-Adapter-Monitor-DELL-ST2420L-ST2320L-ST2220M-/190544923463
Good luck, I'll try to remember to reply to this in a few weeks when the adapter comes.