medic6062

I have a 2007 Edge SEL Plus. I would like to procure an in dash navigation unit specifically OEM. I have seen great offers on ebay for prices that are reasonable. I am however weary about compatibility from units taken out of other model vehicles. While they "look" exactly the same, I am aware they are not. Does anyone have any advice about where to find a compatibility list, rather than contacting the dealer everytime I see a unit I would like to bid on?