Electrochromic mirror retrofit in '98 SLK

I have a '98 SLK and would like to install an electrochromic (automatic darkening) mirror.
How hard is it to install an electrochromic rear view mirror that was
intended for a more recent SLK? How about a drivers-side electrochromic?
Has anyone done this?
Please cc to jhandel (at) att (dot) net. Thanks.
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