I guess you are right. I haven't owned my 540 e39 in five years and with the sand seats the backs must have just been sand plastic. So the problem really is.. if you choose a color other than black or sand you are going to have a multi color seat.

*Looks like Tobacco also has matching seat backs. I figured out the website actually shows you a small piece of the seat backs and shows what color its going to be. Man the x5M has some nice color options for the interior.