Date registered: Jun 2009
Vehicle: 1991 300E
Location: Maryland's Eastern Shore
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Take measurements of the inside diameters, there appear to be at least two different sizes involved, and go to any local parts shop for a generic replacement.
You haven't completed your profile, so I don't know you're located--very helpful information. Grommet isn't the word, in US-English, that comes to mind for what you're looking for. It looks like a coupling to me, generically speaking.
Completing your profile--year, model, location--and asking future questions in the sub-forum appropriate for your year and model will likely get you the best help.
Last edited by 300E91; 06-24-2011 at 05:43 PM.