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Not sure there is an easy way to do this. The factory system is bi-amped and has specific signals run to woofer and tweeter. Here is what crutchfied had to say about installing rear speakers.
"To install this product, you’ll have to modify your vehicle. Use the factory speaker grilles. Fabricate a speaker mounting bracket or spacer. A wiring harness is not available. Cut off the factory connectors and splice the vehicle's speaker wires to your new speaker wires. The factory amplifier sends bass and treble through separate sets of wires to the speakers. You can replace the factory radio with an aftermarket receiver, and the factory amplifier will still drive the rear factory speakers. However, if you want to replace the factory speakers, you'll have to replace the factory radio. You'll also have to bypass the factory amp by cutting and splicing into the factory wire harness".
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