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You would need both harnesses if you intend to utilize the Honda antenna for your radio reception.
My experience with professional installation services is that they tend to cut and splice, forgoing the expense of custom adapters (which you have to splice to the new head unit harness anyways). The Crutchfield adapters have always worked well for me, and the only limitations I have experienced are ones which aren't terribly important, such as dimming the radio lights along with the rest of the dashboard (which is a limitation of the head unit, not necessarily that of the harness or vehicle).
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