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I looked into this for a used E46 and my option was basically swapping the seats out and getting the wiring as well (in terms of the hookups past the seat, switch etc). Even for an older used car this was massively prohibitive. Almost all retrofit items seem to be this way - VERY expensive and complicated to add after the fact. Pretty much not possible in the practical sense (if you want it done well with OEM parts) was what I took away from it.
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