Assuming we are talking about manually detachable towbar.

AHMU ANH_KUPPLUNG_US //Retrofitting Towbar with removeable ball head for US

With NCS add +AHMU to FA list. Save the new FA on both FRM and CAS. Then code all modules (does it according to new FA list).

__________________
E39 530dA -02 M-Sport Messing metallic
E53 X5 3.0dA -06 Sport Stratus grey
E70 X5 40d -12 M-Sport Space grey