P2214H, VESA adapter?

What specific VESA adapters (here, Amazon or any reputable vendor) work with the Dell P2214H monitor?

Have found a few different VESA adapters that work with a variety of Dell monitor models, but can't seem to find one that works specifically with the P2214H. 

I have a two monitor setup, but the stand takes up too much desktop real estate (it's GIANT), and I need a clamp-on so it's secure on a sit/stand desk. 

Prefer not to go with a Dell stand as I'd also like to add an iMac to a 3rd arm. Can't find iMac to Dell adapters, so VESA is the best option.