The EHA does have seals. Make sure that isn't the problem. See the following URL:

http://catalog.eautopartscatalog.com/smittys/sa/wizard.jsp?partner=smittys&clientid=sasponline.com&baseurl=http://www.sasponline.com/&cookieid=16I0WILCJ&year=1991&make=MB&model=300-SEL-006&category=C&part=E.H.A.+Valve+Seal

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"