No XM Radio, Audio Input or Brake Controller...Need help with adapters (CX-9)

[cx 9 guy]

I have a CX-9 GSL Model, and considering how much the vehicle cost its sad that it doesn't have XM Radio, No Audio Input, no Brake Controller.

Purchased external XM Radio, brake controller is where I need help.

Has anyone found a wiring harness adapter that connects to car which would make it easier to install a brake controller.?

And.

Audio input plug would be great. Is there a solution for that?(Not bluetooth).

Thanks.