More on the Crimson 400x400mm VESA Adapter Plate (Black) AD400 below.
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P37F
FPMA-VESA400 - Neomounts vesa adapter plate - Neomounts
Crimson Adjustable Height Dual VESA Ceiling Mount with 2-3 ft Drop
Crimson-Vesa 400X400mm Adapter Extender : Electronics
VESA Monitor Adapter 50x50mm to 400x200mm – VIVO - desk solutions