The only online seller that I know of that routinely shows MB p/n's is http://www.***************

And they don't list much in the way of anything outside the normal replacement items, meaning OE interior and body stuff as well as special engine parts remain dealer only items.

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!