I've searched here and elsewhere to have this question answered: In a 1983 300D Turbo, what is the difference in and application for the two different transmission mounts that the parts store here offers:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1IC0065MQ1WV16K40P&year=1983&make=MB&model=300-DT-001&category=J&part=Transmission+Mount
The one on my car now (which is way far gone) does NOT have the oval tube, but then again, the car had green antifreeze in it when I bought it
Is the oval tube version heavy-dutier? Me no know, but in the spirit of "measure twice, cut once", I thought I would avail myself of the vast knowledge that prowls these pages!