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The non-premium mirror has 2 wires running to it. Both for the LED in the clown nose.
The mirror from the premium package has 10-12 running to it. Clown nose plus the auto dim plus the auto dim for the side mirrors (x2) plus the UGDO.
Since you need to route those wires and tap for their power and ground (I did not see a harness anywhere) you are talking about a lot of work. I have an M Z4 mirror which is a much nicer shape than the mirror in my 135 but I am not sure if I want to open the can of worms that is getting it all to work. Maybe I will work on getting the auto dim to function so I can use it, maybe not. The older BMWs (e36/Z3/e46) mirrors ran through the ZKE module so if you mess up, you mess the car up...big time.
Cliff notes: no plug and play.
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