This DSC is for retrofit to Active Cruise control with stop and go function (and a direct replacement for vehicles with that function). It's for 2008 2009 2010 (LCI) 5 Series and 6 Series vehicles.
E60 E61 E63 E64 (LCI). The part number on the unit is 3451678336 4 (i bought this to install on my vehicle, but i no longer have the car), i was really picky selecting this unit. I went to the dealer and asked why is it not 3451678336 5, they said because it was the original unit on a car, not a replacement part (so if it was a replacement unit, it would be 3451678336 5, but because it was installed at the factory for the donor 6 series, then it has the part number 3451678336 4). Let me know if you have any questions or concerns.