1974 Dodge Dart Swinger 4 door

I have recently inherited a 1974 Dodge Dart Swinger 4 door. The car was originally purchased in 1974 by my grandmother. "New from the showroom". The car has an original 21,000 miles on it. I am not looking to sell it. What I am looking for is some information on production numbers for the 4 door 1974 Dodge Dart Swinger. The only thing I can find is that the Swinger and Swinger Special were available on the 2 door models only.
I know the "Swinger" emblems were not added on by some kid, because my dad and my uncle were the only 2 mechanics to ever work on the car.
Does anyone know of a resource for production numbers on this model of Dart?
Thank you.