2013~2016 Help with speaker wire tap for line out converter.

Hello, I am new to this forum, I'm wondering if anyone can give me a simple answer to which wires I should use from the back of my head unit to tap for a line out converter? Which plug and what colors? I have a 2016 cc 5 with 6 speaker non bose system. Thanks in advance!
 
See the attached pictures. I pulled these off another thread in here or off some random corner of the internet; I can't remember which.

2016 CX-5 speaker wire diagram.jpg

2016 CX-5 speaker wire diagram_2.jpg
 
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