I made a smiliar post on roadfly also but....

Leather Upholstery in the E60
In the E60 there are three types of leather Dakota, Nasca and Exclusive.
Nappa Leather is much softer and smoother than the rather thick and textured Montana and Dakota leather. Montana and Dakota is basically the same leather, BMW changed the name but there is really no noticeable difference. The Nasca letaher is also offered in the E65 and is perforated.
The US will probably only get Dakota and Nasca, atleast intially. All of the color variants below may also not be offered in the US.

Dakota
LCSW Black
LCBA Beige
LCTE Truffle Brown
LCRH Amethyst
LCRK Auburn

Nasca (always and only with option 453 Ventilated seats)
U6SW Black
U6BA Beige

Exclusive (only avialable with option 456 Comfort seats)
LDSW Black
LDRH Amethyst

These pictures show the three types
Dakota




Nasca




Exclusive