I can't see the rest of your Mh, but if you can move the new tv somewhere else, like above current location. Then make the old location a storage area by adding doors over opening.
If you just want a flat screen at current location. Can cut plywood the size of the opening, cut a hole around the center of the wood for wires then cover it with vinyl to match dash. Attach it securely, use a tv mounting bracket for tv, and your done.
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