The E55 probably has memory fully electric seats, and may have multi-contour or dynamic seats, and may have heated seats (probably) and/or ventilated (possibly) seats.
If the seats are multicontour (and if you want that to work) you have to add some pipework and a vacuum pump (which goes in the trunk on left hand side so if you still have access to the E55. go get it and it's wiring). Similar but a bit extra wiring needed for dynamic seats (and some coding of the cluster) (there will be a dynamic button on the seat)
To add heated seats you need to change the lower control panel (to one with heated seat buttons) and the heated seat wiring loom. Same is true with ventillated seats.
If the seats have memory, then again you need to fit a new wiring loom in the car for the memory, and if I remember right the memory and seat control is on the door panel and not on the side of the seat - if this is true you need the appropriate switch pack in the door, possibly a door controller, and possibly the door panel (sorry I can't recall how the switches fit)
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