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I recently sold my beloved 2006 E61 (530xi). I had rewired the (right side) wiring harness a few times, mainly using individual wires and butt splices. But it is so hard to cram those wires into the routing brackets, I acquired a genuine BMW harness and hardware kit fully intending to replace the jury rigged wires this winter. So I have a brand new kit comprising:
1/ Harness 61 11 9 231 820. It runs from near the rear roof speaker out to the individual tailgate connectors. The inside end is connected using new connectors provided in the 2nd kit. (Crimper pliers required)
2/ Connector kit 61 11 9 241 656 includes connector ends/housings, new channel brackets, and wrapping tape
You can check realoem.com for your exact model to make sure it fits.
I also have a couple of used diversity antennas I'll throw in. I think at least one may work fine as I replaced it before realizing that it was a wiring problem.
These kits retail for about $400 US at ECS. Save big with any reasonable offer considered plus shipping cost from Canada Postal Code V0R2W2