'68 Valiant - rear width question

Has anyone ever measured the overall distance in-between the INNER fender wells on the REAR of an A-body mopar?
In other words, the overall measurement that would include the width of the rear end and both wheels/tires...plus room to clear the inner fender tub?

(I'm assuming, but may be wrong, that this inner width should be the same on all A-bodies duster/dart/valiant from '67 to '72?)

My reason for asking: I'm trying to calculate the ballpark width of the rear end I need, in order to fit the wheels and tires I already have for the car.
I would just remove my wheels and take this measurement myself, but my Valiant is currently in another state.

Thanks in advance!