Ok so here's where we stand:
They are replacing the urea tank because the sensor is faulty and BMW doesn't make the sensor available separately. Bad design.
The parts that were ordered:
*2 injectors
13-53-7-808-094
*Intake gaskets
11-61-2-246-945 (6)
11-61-7-790-198 (6)
*Urea Tank
16-19-7-222-146
I checked the realoem.com price on the injectors and they are $482 each.
The intake gaskets are just that. They are seals for the intake manifold. These are the parts that we are waiting for.
The Urea Tank part number is listed as a fuel tank on realoem:
part #1 on the diagram (expensive!).
So I'm waiting to hear back if the parts arrived today.