The mounts can be found here:

http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1KX04M32Z1NT0V9HTH&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1990&product=B1010-25249&application=000043621

for instance, and a replacement air cleaner housing from a junkyard would work better than a repair.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7