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You have a tcu on the top and a mulf on the bottom. My only concern would be the orientation of the devices. The TCU has thin wires in the back and antenna in front. The MULF has thin wires in front and usb connector in the back. A combox will have the thin wires on one end and the BT antenna/usb on the other. So just make sure your black round usb connector in the back of the mulf will reach the front area. I think people may move everything over to the left side of the trunk.
The white/pink connector on the tcu is the bluetooth antenna. You won't connect the other antenna on the right side as they are not used. You also have 2 pairs of fiber. One is no longer need after the retrofit and must be removed from the "loop" for everything else to continue functioning. This can be done with a terminator. Or alternatively, see the attached pdf for satellite radio installation. It has the procedure for adding a device to the fiber loop. Follow those instructions backwards. I have attached a pdf for the E63 retrofit. This has good instructions that carry over to the E90. And finnaly I included the wiring diagram. Ignore the line in red as they are not needed.
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