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Steering controls won't matter as you don't have them, as for color match...You are replacing everything so there's nothing to match. Only wiring work to do is the hazard switch.
I am considering swapping a newer Bose for the one in my 05 roadster. Id like to have the audio steering wheel controls too which also means a steering wheel swap. What exactly is needed for the swap. Also, what is a "waterfall" (Im a brand new Z owner). Im guessing its the wire harness.