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Aftermarket Stereo - PLEASE HELP

I bought a new head unit and the Metra wiring harness. It comes with two separate harnesses and they do plug into the factory harness. The problem is that the car's left harness with power and ground also has all the speaker wires. But, the Metra harness only has the power and ground wires on the left harness. The right harness contains all the speaker outputs. I don't understand how the Metra harness can possibly work when the speaker wires seem to be on the wrong harness. Am I missing something? I have posted a picture diagram to help explain what I am talking about.

https://www.dropbox.com/s/xc4l1gun48...%20Diagram.jpg

I have installed 4 or stereos in my life and common sense tells me something is wrong. The harnesses plug in, but all the speaker wires are on the wrong harness. I actually have 2 Metra harness kits and they are both designed this way. I would really appreciate some insight into this since my dash is all torn apart now.

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