'65 Coronet to '65 Dart Rear

Man, I guess I should have known what I was talking about before I said NO.
You were right. The '65 Coronet rear is wider. Flange to flange the B-body rear is 55". The A-body rear is 51.5". From spring perch to spring perch center the B-body is 44" and the A-body is 43".