Companies like periphial make input modules that have two plugs. One plug would connect to the plug that would origionally run into the back of the radio. The other plug would run into the radio so the box kind acts like a go between that you put in between the plug and the radio that introuces data from an alternate input source. There wont ever be any use in the front of the factory radio unless it has a factory eigth inch jack in the front. The aux input adaptor will come with one that you will have to relocate where you can easily reach it.
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