The file 'VESA Mount For Horizontal TV/Monitor Use (M4 Bolts) 3D Printer Model' is (stl) file type, size is 57.8KB.
These are built for M4 bolt size. You will need (4) Mounts and (8) Feet. I used M4 x 20mm (requires 8) bolts. The outer feet i locked with a washer, lock washer and nut (4 each required). (See Picture)