I couldn't find what connectors I needed so I just pulled the radio out of my new 2014 and cut the 4 pair of wires and tied in my LC7i and kenwood amp and pioneer sub. Sounds great it wasn't hard at all.
The thought of doing that makes me cringe. Glad it worked out for you though.
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I believe You have it backwards. I think you need (2013 model)
2 of the 70-5524 to make one populated enough to plug into harness
1 of the 71-5524 which comes fully populated to plug into OEM head unit.
I don't think anyone has successfully done this as of yet. I am still waiting on harnesses to show up in the mail.
I know what I'm doing this weekend. Have enough to complete 2 harnesses, 1 for me and 1 for whomever. 1 of those packs will serve as the donor for the other 3 for a total of 5 harnesses once the other 3 male connectors arrive.