Is this the damper?

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CQ0J3JZ42DI1F5FGI&year=1980&make=MB&model=300-D-002&category=All&part=Vacuum+Dashpot&appChassis=_any