Steering Box Universal Coupling Sizes

My 65 Dart original steering box universal coupling is too small for the rebuilt steering box. Original steering box diameter where universal coupling slides on is .625 in dia. & the rebuilt box is .723 in dia.

The box rebuilder list a range of models (dart, charger, coronet) & years (63 to 72) for the box.....is there a chance a different model or year carried a different coupling that would make my setup work.

The rebuilder was contacted & claimed I must not have original equipment............& doesn't know enough about the various years & diameter possibilites........