Is 126-410-04-15 the correct part number that will actually be stamped on them if you buy them from the dealer? I ordered some online and got 126-410-02-15 and 210-411-02-15. I assume those are the wrong ones, they would fit but one is way thicker and the other is thinner. Do I just spend another $200 and order the proper ones?

The part number you give of 126-410-04-15 is the correct number and should be on whatever you ordered from whomever. Send them back and get the correct part.

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Thanks, I think its too late to send them back but I ordered more of the right ones. Anyone who gets them from the dealer apparently needs to check to make sure what is in the box though, as the ones I bought were in sealed Mercedes boxes from one of the dealers that sells online, and the part number was right on the box but still was the wrong thing.