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

Thanks,

Collin