What T-Harness for the s650 premium with factory amp / NON B&O - 9 speaker

[Fl_topless_bl_stang]

Anyone know where to get the correct t harness so there is no cutting at the factory amp in the rear tail light area on the driver side of the car"?

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[Ragstrom]

I know most people like Posi-tap. I'm slicing and dicing, going to use Wago connectors to feed my subwoofer amp. Love the way Wago works for audio work.