I made my third attempt at the m5 sport seat swap in my 520, my friend and i wired up the passenger side just fine with new wiring, and she powered right up, the drivers seat is a soup sandwich though, the connector i have is different and we couldnt get it to power up at all. So bottom line is I have an entire m5 sport seat interior with rear headrests, and door panels that are useless to me, anyone want them? i only want what i paid for, for them ($250.00 ) , plus shipping, so let me know all.