Flywheel/Torque Converter Centering Hub

[mtocrs1]

I posted this in the tranny section and didn't get much response so I figured I would try here as well
Started getting ready to pull the engine on a GN I just bought and found this thing in between the flywheel and the converter.
Why is it there?
It's supposed to be aan Art Carr non lock up converter.

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[mtocrs1]

It looks like a centering hub for the converter but the torque converter bolts should center it.
It is bolted the backside of the flywheel on the converter side


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[earlbrown]

Looks like some sort of bored step shaft to extend the centering hub. I've never heard of it before but I noticed the spacer feet on the TC bolts.