I have an 06 FX4 with aux button for Sirius but no install from factory. Manual states press aux button for Sirius As I understand it there is a plug in the back of radio unit to hook up Sirius. When ordered from factory is there a seperate reciever for Sirius which is mounted under dash or is it somehow incorporated into the radio unit. In short, I want Sirius so do I purchase a Sirius receiver (specific for Ford???) and mount under dash and than plug into radio or is it a wiring nightmare. Tried a search, got nowhere. I do see on Ebay tons of Sirius units for sale but dont have a clue what to order??



:help