It is often said that Tesla cars don't have "model years". But Tesla CPO and any used car site think otherwise. So, when searching for a used Tesla with AP Hardware, should I be looking for cars advertised as "2014", since the AP Hardware started being delivered around October of that year? Or are those cars considered "2015"? How do I find out from photos if the car has AP Hardware? Many people, especially non-Tesla dealers, have no clue.