The bearing you show is only part of the issue.
The plastic retainer is more likely worn away and the shaft is now able to move around off center.
I'm unaware of any OE style Pontiac retainers, unless you luckily find an NOS.
Option B is trying to find a good used but remember these are old and brittle just like the one that failed.
Option C would be using the aftermarket '66 Chevy Retaining/Bearing assembly which it has been said works.
I don't know this first hand.
Option D is a Billet retainer with roller bearing.
This was offered in the past From Hammer Time Racing, This is the route I went when mine failed a few years back.
I do not know if they still offer these.
Installation of a replacement is very straight forward but requires column removal.
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