https://www.fleetsafety.com/vehicle-equipment/consoles/console-accessories/filler-panels-and-faceplates/
There's several options for filler panels to replace the two that are missing on yours.
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Carling V- series switches are probably what your console has knockouts for. Just search for rocker switches on Amazon and find the one at the price point you want.
As far as the voltage read out there's several options for that. I would probably find a usb outlet with a voltage readout on it...