BRATECK 32-55" VESA Adapter Plate. VESA standards 300x300/400x400.
Vesa Adapter up to 400 x 400 VESA Holes
The LCD-201R adapter allows VESA 200 x 200-compatible mounting plates to support TVs with VESA 300 x 300 or 400 x 400 hole patterns. It attaches easily to wall mounts and any mount with a particular interface.