harold balls wrote:
yes the blue plastic is a condom.

Sometimes the base of the condom (where the serial number is) has got a
bit of glue to hold it to the lamp or the circuit board, but usually it's
just a friction fit. You can roll it off of the old lamp and on to the
new one.

One of the lamps were still working and I measured the voltage across it.
It was about 10.5 volts.

It's probably a 12 volt lamp, with the voltage to it dropped down by the
rheostat on the dash that lets you dim the panel lights.

With this new info, I'd try in this order:
1) incandescent replacement at hobby shop
2) incandescent replacement at Mouser
3) blue LED replacement at Mouser or Radio Shack

Like I said, you'll need a resistor in series with each LED if you go
with the blue LEDs. The short cut is to use a 1000 ohm (1K ohm), 1/4
watt resistor in series with each LED. The long cut is to buy a 2K or
5K potentiometer - knob or screwdriver type, it doesn't matter - at
Radio Shack, and temporarily wire it inline with a blue LED. Put the
pot on long wires so you can get to it with the dash put together.
Reassemble the dash, then wait for night and turn on the panel lights.
Adjust the pot so that the LED is about as bright as the rest of the
panel lights, and behaves about the same when you dim the panel lights.
Take the dash apart and measure the resistance of the pot, then buy
fixed resistors of about that same value and install one in series with
each LED.

Good luck!

Matt Roberds