If it still rattles after all that, you'll probably also want to do a pair of these:

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=23W0K8UVH2BL0MFV3U&year=1983&make=MB&model=300-DT-001&category=L&part=Sway+Bar+Link

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1989 300E 144K