These are common wear items>

http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1OR00DL8F1OR1CO1KF&year=1991&make=MB&model=300-SEL-006&category=All&part=AT+Shift+Linkage+Bushing

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)