Some wierdness. I did some looking on eBay and there is a company SVB that the seller claims made in Germany. There is a set a black one and white one and I also saw pics of 2 white ones.
Lemforder appears on eBay as well as CORETCO. The emborders cost more than the claimed OEM ones.
On your year and model should the transmission mount be changed along with the motor mounts?
If they still make them and the ones you have been using are liquid filled: the Creative Steel manufactures upgraded ELIMIVIBE® polyurethane engine mounts for the E320 CDI in the below may be interesting.
"AI Overview
For a 2006 Mercedes E320 CDI, Lemförder (Lemfoerder) is widely considered the best choice, as they are the OEM (Original Equipment Manufacturer) supplier for Mercedes-Benz, offering the precise hydraulic damping required for the diesel engine.
Corteco is another high-quality OEM alternative.Top Recommendations:Best Overall (OEM): Lemförder engine mounts provide the smoothest ride and longest lifespan, often available through FCP Euro or Newparts.com.Premium
Durable Alternative: Creative Steel manufactures upgraded ELIMIVIBE® polyurethane engine mounts for the E320 CDI, designed to last longer than stock fluid-filled mounts without excessive vibration.
Budget OEM-Equivalent: Hamburg-Technic is often cited as a lower-cost option that still provides solid fitment, available on eBay."
OMG the creative steel ones are extremely expensive.
https://creative-steel.com/shop/mercedes-products/e-class/e320-cdi-05-06-w211/05-06-mercedes-e320-cdi-elimivibe-engine-mounts/