96 & 97 E320 rear view mirror issues

I'm looking at a couple of used ones for work cars. (I drive about 100 miles a day and drove an old 300DT for a while. Definitely a step up from my recently-
deceased 91 Camry [291K miles!].)
Anyway, both E320s, 1996 & 1997, have a broken rear view mirror! It seems the oddest thing, how this would happen. But both just hang there and flop around.
Is it a big job to replace? I seem them for $100 to $200 or thereabouts on http://www.car-part.com Any serious technical concerns in doing the job?
Thanks,
Collin
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No answer on the mirror but you should know that of these models the '97 has the 5 speed electronically controlled overdrive transmission. Its a very smooth shifter and preferable to the old 4 speed hydraulic box, IMHO.
The mirrors are electronically dimmed and it could be that some dimwit didn't know this and tried to "fix" or adjust them. At first I was also puzzled by the mirror - but I didn't manage to break it!
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