Body Style Numbers

Not all styles were built by Ford. Ford had their numbering system. Other body builders had their own style numbers.
 
I'm not certain if you are referring to letters after the model numbers or to something else. If you might be referencing letters that might follow the body numbers, then these would typically refer to the model changes from 1928/29 to 1930/31. As a for instance, a 150A refers to a 1929 Station Wagon; a 150B would refer to a 1930/31. Similarly a subsequent number might also refer to another designation for a different version of a model, as for instance a 68A would refer to a 1929 Cabriolet; a 68B would refer to a 1930/31 straight windshield Cabriolet, and a 68C would refer to a slant windshield Cabriolet. I'm not sure if this is what you were referencing or not.
 
Letters were used to differentiate between the first, second and so on editions of a particular body style. For example, a 1928-'29 Coupe is a 45A whereas a 1930-'31 Coupe is 45B. In other cases, letters were used to differentiate between different manufacturers of the same body style. For example, the 165 Fordor made by Briggs is a 165D, and the same model Fordor made by Murray is a 165C. An excellent reference book on this topic is Steve Plucker's " The 1928-1931 Ford Assembly Plants & Their Production of The Model A Ford Passenger Cars."
 
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