I have the same problem. I was able to fix it temporarily but as the contacts were bad but it broke again. Mercedes nor Chrysler don't have the part and one place wanted me to buy the whole headlight assembly for $500 to get it. Luckily the car has a few other things wrong with it so with nearly 125,000 I'll be getting rid of it before I'm due for inspection next month.
I feel ya...it's such a shame that it's impossible to find parts...and brand new headlight is 500...
I read on this forum somewhere that one guy repaired it with stripes
of copper tape, I might try it too