Replacement keypad cover or a Xantrex Prosine 3000 watt inverter charger.

Off the shelf replacement keypad : https://www.amazon.ca/dp/B0719PLRY3?ref=ppx_yo2ov_dt_b_fed_asin_title

1x4 4 Key Matrix Membrane Switch Keypad Keyboard 65x20x0.8mm DC 12V

You will need two of these pads.

You will also need 4 small nuts and bolts to secure the new panel to the old and 3 X 20 mm long stand offs to accommodate the additional depth of the rear box. You can buy or print.

The wiring is simple common ground for all switches.