Car-Part.com--Used Auto Parts Market , look up the MB E55, then look at carguts in the listings.
I got mine from them, they were nice folks to deal with ....
( I even was stupid enough to order the wrong TB, they paid for shipping back and sent me the correct one : A 113 141 0125 )
carguts currently lists 26 of them at $85 a pop .......
you could just call them at 1-866-839-2708 and make sure they send you the above part number.