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These are two North Bayou monitor arm mounts. I got it from Amazon .
They are the best arms I used so far. It has something called gas-spring feature which helps you in moving the display or rotate it with less pressure with Cable management.
I got this monitor arm on Amazon. It's cheap, fully-articulating, fairly easy to setup, and you can peel off all the obnoxious yellow stickers. It holds my even heavier AW3418 easily.
Northern Bayou. [link]
I had to get the heavier rated arm (6.6-19.8 lbs) for the x34 because when I weighed it it was around 16.6 lbs without the stand. Glad I did to because I got the 14 lbs arm for my XB271HU and that seems to be about the max weight it will hold (~12.5 lbs).
For the X34:
For the XB271HU: