Like those Lexus GS w/ White License plate light?
Well............ this modification can last approximately 100,000 hours - That's about 92 years!!!!!!! (3 hours driving a day w/ lights on)

I didn't buy the "Xenon bulb" because it is still gas charged, and it exceed 5W of what MB recommended. LED mod basically has no heat and will not over load your current.

1. Get a pair of 6-LED D36mm festoon bulb. -size between 36mm to 41mm
2. Get a 100 ohm 10W resistor from Radio Shack ($2)
(sole purpose is to "fool" your car thinking the license bulb still working)

Step 1, replace your license plate festoon w/ LED Festoon.
Step 2, Parallel connect, ONE of the resistor to the Positive and negative wire of your festoon socket.

(UPDATE!!!!! ONE resistor per side!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!)

*********NO MORE "DEFECTIVE LAMP" warning on your cluster **************

thanks to http://www.benzworld.org/