How did you get your hands on M50d brand new seats?
To the right person, these seats would make a very nice upgrade if their cars does not have multi-contour (comfort seats) seats ...
They may even retro-fit in an e70. Color wouldn't match , but who cares when it's a comfort seat!
The problem is that you have to be able to code the VO (Vehicle Order) in order to accept the seats. This is not trivial and requires access to coding software.
This guy did it on a 2012 e70 X5d (and he is a BMW tech):
Coding expert needed