As previously stated; quite a few People have simply used the 300D 617.952 mounts and I can't recall anyone saying they had an issue caused by that.

Motor Mounts made by Phoenix are the Stock Mounts at $115 or more from the MB Dealer and are made in Turkey. Phoenix= Stock Mounts = Lemförder/Lemfoerder/Lemforder (Lemfoerder grinds off the Mercedes star but for some reason leaves the Phoenix Logo).
If you shop around the Lemfoerder Mounts are reasonably priced (prices are always changing).

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84 300D, 82 Volvo 244Gl Diesel