dual monitor stand to support 34" and 28" monitors

I just bought a montior stand and I'm trying to figure out exactly what kind of screws I need, and whether both of my monitors use the same screws.

I have an LG 34UM58 monitor, and a Samsung P245OH as well.
I also have a samsung LU28E510DS/ZA, so I need a dual monitor stand that supports both of my large monitors.

I currently have this stand, but it' won't work.
https://www.amazon.com/Monitor-Adjustable-Computer-Management-HUANUO/dp/B072J1CSCD/ref=sr_1_49_sspa?s=electronics&ie=UTF8&qid=1511889498&sr=1-49-spons&keywords=dual+monitor+stand&psc=1&smid=A1W1TYQC4XP3K1

Any idea's what type of screws I would need to mount these monitors?
DanNetwork EngineerAsked:
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Jackie ManCommented:
Both of your large monitors support vesa mount, but your dual monitor mount is designed for monitor up to 27". You need to buy a new mount.

Dual Monitor Stand, Free Standing Height Adjustable Two Arm Monitor Mount for Two 13 to 32 inch LCD Screens with Swivel and Tilt, 17.6lbs per Arm by HUANUO
https://www.amazon.com/gp/aw/d/B074K35TJZ/ref=ox_sc_act_title_1?smid=A1W1TYQC4XP3K1&psc=1

The one above should work.
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DanNetwork EngineerAuthor Commented:
Thanks, I know, I needed something that the arms move independently.  I found some, but they are like over $200.
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Jackie ManCommented:
"I needed something that the arms move independently. "

Then it is better to buy two single monitor mount to suit your budget.
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David Johnson, CD, MVPOwnerCommented:
samsung LU28E510DS/ZA requires an adapter to use VESA 100x100 https://www.amazon.ca/Adapter-Monitors-U28D590D-S27D590P-S24D590PL/dp/B01BFWRH7U
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