I am curious were you able to tell who made the OEM mounts?

On my 84 300D it is Lemforder=Phoenix= the ones sold by Mercedes were all the same.

Another company that makes what was OEM stuff is SWAG. SWAG made the long timing chain tensioner rail that came out of my engine and also the replacement I bought.

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84 300D, 82 Volvo 244Gl Diesel