I have a 2012 Dodge journey with the 8.4n radio with navigation (hence the n). Could someone verify the correct telematics module part number for me? It was quoted as the 68222279aa but by Vin at the dealerships it's the 68222278aa one, which is two hundred more dollars. They told me the 78aa would not work. I just want to know if they are trying to con me for a more expensive part...thanks..