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I just went through this with my 2011 135i. I replaced an entire interior. I had non power but heated seats. I was able to take a full m-sport interior with power movement/lumber/bolster/heated and make it work. Look on facebook marketplace. I can't speak for all the seats but i would try to stick with either 1 series or same years of 3 series. you have to get into wire splicing and re-pinning connectors. it is not plug and play. It is possible.
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