A727 Stator

Good Evening,

I am looking for some clarification to repair a missing check ball in the stator.
Car is a 1974 Dart Sport 360 with matching engine and A727 transmission.

Long story short; The lugs on the inner pump gear were sheared off. See Photo. Likely cause was TC not seated properly. I found 2 small deformed metal pieces , which appear to be parts of a check ball, in the front pump seal.

The transmission shop advised that the pieces are from the stator. Also to find a check ball and wedge it in and seal so it is airtight. See empty hole in photo.

Is there supposed to be 2 check balls in a 1974 A727 ? Stator is stator1.jpg Part 2466685 L-12

If so, what is the best way to fix this? Any special ball?