Ergotron 24-314-026 Mounting Arm with 19.5-Inch Height
http://www.amazon.co.uk/dp/B00BRBX3SW?tag=dedik-21
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Ergotron 24-314-026 - 24-314-026 WorkFit-A II, HD, Single, 5" Lift Engine and Worksurface, Polished Aluminum
http://www.amazon.co.uk/dp/B00BRBX3SW?tag=dedik-21