I need to place the front seal of the power steering pump on my 1981 300D. At the link below there are two different sizes of front seals listed. Does anyone know how I determine which seal to purchase?
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1ZQ0ZONA71ZQ0ZPY5O&year=1981&make=MB&model=300-D-002&category=M&part=P%2FS+Seal