You have to replace the whole harness, from the boot up to the head unit, as the Bose system has larger speaker wires and low-level outputs for the amp which the standard system doesn't have. All the antenna cables for nav, radio, tv etc are also in the same harness.
Seats, carpets, rear shelf and centre console out to get to it all, but its easier to do that than to try and pick apart the harness.
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