By shack do you mean run-out or wobble when you spin it?
If so I'm sure some is acceptable but I don't know how much.
There may be a spec in the service manual.
Do a search for the svc manual and maybe there is some info there.
Bearings, just did that recently myself. Problem solved.
You'll need three, 2 are the same and the third bearing is for the cush drive (i think) which is a bit bigger.
What they said. Your second post helped to clear up your question and get the right answer.
Good luck with the repair and welcome to the forum. Ask questions when needed. Lots of smart folks here.
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