I'll have a look for my old pump, but I don't think it could be anything else but the bushing. It should be a fairly soft material, but I think it welded itself to your torque converter.
In those pics, I see that your stator shaft is completely stripped of teeth. Just out of interest, what was the driveability like before you removed the trans?
Unfortunately, those teeth will have ended up in the transimission. Judging by the condition of these parts, I would draw the conclusion that your transmission is on its last legs. The metal from that shaft alone is enough to chew out all the needle bearings.
The stator shaft is not very expensive, although if it is the early type, it will need to be pressed in.
You may be able to purchase the bearing bushes from the dealer as they have separate part numbers.
For a good idea of what the rest of the trans is like, you can pull the front shaft off the gear assembly in a forward direction. If the needle bearing and/or the shafts are cactus, then it is almost certainly time for a full rebuild.
There are some pitfalls when rebuilding, although the manual tells you what needs to be done.