Allmercedes just sent me some engine mounts in Febi/Bilstein boxes (with their part number).
I ordered Corteco engine mounts (OEM) and hence gave them a call.

Their answer is that even though they are branded Febi/Bilstein, they are in fact still made by Corteco and are identical.

Is this true?

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Smoke Silver 1994 E220 Coupe Automatic
0 kilometers 6 September 1994
100,635 kilometers - 6 September 2010