A Body Rear End Width 34 Dodge Bros. Truck

:thumbup: Alright-Goofie question. What is the width of A body rear ends? Other mopars? How do I measure? I now know that rear ends like the 7.25-8 3/4 are identified by the diameter of thier O(pinion?) rings but I don't know about width. I know someone with a 1934 Dodge Brothers truck and he needs a rear end the same size of his stock front. He is putting in a rebuilt \6 so he just needs a rear end that will fit. Any help appreciated. Thanks