Interestingly, when I inquired at the dealer, they claimed that there's a risk of losing the pin....so they need to drop the pan, etc., etc... And they want to charge me $350-400!!! Apparently, they're quoting the price ASSUMING that the pin is going to fall into the transmission, even though hopefully it won't.

While they don't sell the O-rings by themselves, they (the parts dept.) sell the plug with the O-rings for $11 (part # 203-540-02-53).

From the way a couple of you guys have described it, it sounds like the simplest thing in the world....is the dealer exaggerating the risk??

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife