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Old 01-26-2012, 02:55 PM
ChiefRider ChiefRider is offline
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Join Date: Dec 2011
Location: North West CT
Posts: 378
They ARE drains, and MB frequently did cover them with undercoating. Scrape it off on the outside, and they should have a sort of one-way arrangement of molded rubber to let moisture out.

There is also one in the spare tire well.
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1991 350SD
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