I wanted to buy a video adapter for my MBPro and was able to see the model number on the old one: A1307 But looking for it i found it is also called MB572Z/A I know this is an old question, and apologize i could not find the answer with Google but it seems so stupid, i want to know the answer. There is always the same confusion with Macbook model numbers. There never seems to be a simple consistent clean model number when you are looking for parts. If you look in the system description it gives some ambiguous 9,2 when you need to know A####.. you have to know when it was manufactured.. I am not even sure the model # is written on the case. Why two Applemodel numbers on parts? Why all the confusion?