Skidoojunky

So earlier this year I bought the wife an 08 limited with 7500 actual miles on it. It had most everything but nav and DVD. My neighbor sells used late model interior parts and just last week parted out a 08 limited with nav and DVD headrests. He got all of the wiring and hardware and has offered them to me at a fair price. My question to you is once we complete the install do we have to have an unlock for the head unit or have it mated to my edge? Or will it be plug and play? Thanks junky