FWIW:
The pulley is the same inside diameter for GM Delco generators for decades.
Even the early alternators in the 60's,(ford also)
just match the O.D. & pulley offset.
No need for a big $$ pulley, $5 is about right.
An old skool rebuild shop will fix you right up.
Usually the end bushing has a wick into the cavity to get to the motor oil in it.
Some have a flip cap on them, others are just a plug lightly installed.
Bushing:
The hardest problem is pulling the bushing out of the blind hole, without breaking the end cap if you choose to install one.
Also some bushings have a place milled into it for the wick to set, orientation is important on a new install.
If it is in good shape, don't fix what ain't broke.
There was a fellow in Evil pay that would sell field winding's & brushes/bushings.
Some of those field windings are not so easy to fit around the pole shoe after you even get the old one out.
Another reason for an old skool rebuild shop.
And as said before, a properly rebuilt delco is better than new, off shore built.
Edit:
That pulley fellow on epay seems to have what you need in his store if you go that route
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