Cornfused

Did the '64 Dart come out of the factory with 9 inch 2.0 width for brakes in front, or 2.5's ? Maybe it's all about the model/engine ? I am trying to order up new parts, and NAPA and O'Reilly's both carry the 2.5 for the front. I KNOW I have been replacing the 2 inch all around for YEARS. WTF! Is this why I have go but no whoa ? Should I have been buying the 2.5 shoes for the front ! And, if that is/isn't the case, can I just buy the larger 2.5 drums, etc. for the front now ?????????????