The bearing is part of the bracket...
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FX0MB1RS1PN0VD649&year=1992&make=MB&model=300-TE-001&category=G&part=Fan+Clutch+Bearing+Brkt
The pulley bolts to it as does the clutch through the front...
Noise usually means bearing.

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html