Hmmm Mr. Wong I don't think there's a part number. BMW sews there heaters to the leather so if you want OEM you would have to buy a new seat you might be able to get the rear seat switches from the dealer or a part out on hear. Now if only someone on here modded there rear seat and added heaters and wrote a guide for it. rubbing the my magic lamp... genie I wish for a guide. A writeup on adding heated rear seats.

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E53 06 3.0i

wishlist
Comfort Seats
speckdock 2.5

Mods
Air suspension - wip
skid plate replica - in box
OEM sunroof deflector
OEM bluetooth streaming
navi,dsp,tv retrofit - wip
Low prof roof racks
2 directtv satelite tuners
Grom audio usb2
quarter and back window sunshades
2 10"subs- boxes opposite sides/Alp MRP-M850
rear heated seats retrofit
rear footwell lights retrofit
remote window roll up