Mounting measurement terms
This is a measurement method, not a product specification.
Mounting a television needs the mount maker’s hardware limits and the wall or surface you are fixing to. A diagonal and a VESA pair are not that instruction, and this site does not produce drill-hole coordinates or certify a wall.
A VESA figure, when a record has one, is two distances in millimetres between the mounting holes: horizontal and vertical. It identifies a hole pattern. It does not say the mount is strong enough, that the screws are the right length, or that the wall can carry the set. Hole pattern and load rating are different facts.
The cabinet width and height matter for whether the mounted set clears the opening. The depth of the mounted set depends on the mount and the panel, not on the stand depth. A stand-configuration depth must not be reused as a mounted depth.
Manufacturers also publish clearance around the set for ventilation and connectors. If that clearance is not on the manufacturer’s page, leave it unknown. Do not invent a universal bezel or a universal gap and then treat a close fit as approved. Your own extra margin can be recorded as your margin. It cannot reduce a manufacturer minimum, and it does not fill in a minimum that was never published.
Follow the television and mount instructions for the hardware, the fasteners and the wall. If those documents disagree with a secondary listing, the product instructions are the ones to resolve before anyone drills.