Just hook the speakers up and use trial and error until they sound in phase.
Start with grey being positive and blue being positive...stick your head at the midpoint between them and see if you can hear any cancellation. If you can then change 1 of the wires on 1 speaker only.
If that works then go to the front of the car and see if you can hear the rear speakers or if you can hear any cancellation....if you do hear cancellation then switch BOTH the left and right speaker wires to bring it back into phase.
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