i've found the 2 steering wheels on the net.
and there is really a wiring issue to retrofit it just with the actuator and the module.
You have to change the wheel. Because there is no wiring itself to order.
see attached pictures
the left is without LDW LCW and the right is with. there you can see an additional wire which goes to the module place and a one end which ends in the right hole which is empty on the other wheel
2010 BMW 535d GT