I think that he is looking for that piece
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1CX02Q9W81OD100IRT&year=1987&make=MB&model=190-E-004&category=J&part=AT+Modulator+Valve
Located on the left side on the transmission....
easy to take off, but hard to put it back.....
can take it off less the 5 mins, but spend about 3 hours to put it back..... the top screw is very very hard to put back....