904 converter question

Dart_br said
This is the size of the pump shaft. The stator hub in the converter have the same splines count, but is much bigger, like 1/16 bigger. The pump shaft spins inside of the stator hub. Is that normal? I'm a 4spd guy, automatic transmissions are completely new to me.
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From the photos it's difficult to see, but do the stator splines look new? The reason I ask, is if the splines haven't been replaced, they could just be worn out. Not every converter rebuilder replaces the splines(saves them money).