Legit question.
Although your mounts are the same , many Benz chassis have left/right specific mounts.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1W70PZW4N20Z11X9IC&year=1996&make=MB&model=C-280-001&category=A&part=Engine+Mount