A company used to make books with all the Frame dimensions , but I can't remember the name . You might google it and have some success , or best bet would be to stop by a Body shop and ask them about the older frame books ! Shops that do restorations or use older frame equipment would know !
Your best bet is to check local body shops and see if they have the old books that typically had these dimensions. Alternatively, you can contact Dodge US or a Dodge dealer and ask about this; Dodge US contacts are available on www.dodge.com/en/.