I have a 2008 GT500 with the Shaker 1000. I have just the standard head unit and would like to upgrade to the display and hopefully bluetooth. Is there any difference in Ford head units from the same years? I see different part numbers listed but can find almost no info on compatibility. Is there special Shaker only functions in a unit for our cars that one for say an Edge wouldn't have? The plugs and everything else on the back is identical. Sorry if this has been answered before. I have been searching all afternoon with very little info found.