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Depends on what functions you want to work and those you can live without.....minimally you will need an E-NET and ESYS and some wires.

Seat heaters and seat ventilation both run on the LIN bus from the center climate control panel over to the JBE, which then converts it to the CAN bus over to the seat module.

If you want memory to work, this will be much more entailed....

Hopefully your "new" Comfort seats are pre-LCI.
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