Now you need to replace the strut bushings. The thump in the rear you're hearing going over bumps is due to the collapsed strut bushings.

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FI0QTEA41FI0QTP0S&year=1986&make=MB&model=560-SEL-001&category=L&part=Shock+Bushing , should link you to a picture.

__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.