You asked . .. we answered ..
Now do what ever you want.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1D00YU6RY1KZ18WD92&year=1993&make=MB&model=300-E-004&category=F&part=Spark+Plug
Notice they know not to even give you a choice ...
guess why....
..cuz they know 104.992 engines ONLY LIKE F8DC4s .. as they are not a conventional ignition system, they are a Waste Spark System.