LaFong

I have had my GT at the dealer for several weeks now getting the factory nav repaired. The reception was very poor, only getting 0-2 satellites. They have replaced the antenna and the head unit, no help. The latest theory is that the bluetooth Mobile Ease somehow interferes with GPS. They laid the antenna on top of the dash on the passenger side and got 7 satellites. [:@]

val_gt/cs

Does anyone know where to get the right one from somewhere other than ebay? I have heard that the factory navi unit has to be the right one to match a mustang. there not all the same. I have tried doing some research and the part # 7R3T-18K931-AC works in a '07 coup. Is this correct? factory or aftermarket? I'm leaning towards factory. maybe. I just can't find the right one for a good price. thanks for any help