The engine is supported by two engine mounts, one at each side and a third one at the rear on the transmission.

Engine mounts:
http://www.**********.com/search/product.aspx?sid=oedkhkjwk5qry445nqkh0v55&makeid=800016@Mercedes&modelid=1193958@300E&year=1993&cid=20@Engine%20Parts,%20Seals%20%26%20Gaskets&gid=5552@Engine/Motor%20Mount

Transmission mount:
http://www.**********.com/search/product.aspx?sid=oedkhkjwk5qry445nqkh0v55&makeid=800016@Mercedes&modelid=1193958@300E&year=1993&cid=33@Transmission/Transaxle%20System&gid=8616@Transmission%20Mount