I'm going to attempt to build a new AC panel faceplate so I can do custom LED illumination.
Since the OEM plastic plate is no longer available, I'm starting with a clean flat 1/4" thick Lexan sheet. My guess is the OEM parts were used up for melted plates from the lamps staying on all the time. Also you should remove the shifter plate before you remove the AC panel or you risk breaking the plastic and damaging the decal.
For now I plan to stick the the currently available fascia decal. I think you can make a custom one pretty easy by making colored labels and just making a black layer with cutouts to cover them.
There are four standoffs on the OEM plate the hold it in the correct location and correct distance from the metal mounting plate. The two light switches also have a ring to hold the distance but I don't think I will need those with my thicker Lexan plate. This will give me a little more than a 1/4" to mount a circuit board with LEDs and drivers (resistors or constant current circuits).
This is a project I've always planned to do. I still have incandescent bulbs in my AC panel. I never liked the result using LED bulb replacements.