I stand corrected. The 400E / 400SEL mounts are the same. For some reason, when I first searched for (124 240 2617) I got a picture for the 300E mounts, and I know what those look like. But 124 240 2617 is for the V8 W124's only, my parts site listed that they fit the I-6 cars too. Sorry for aiding in your confusion. You infact, do, have the right mounts.

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1991 300E - 212K and rising fast...