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I looked on the microfiche and it shows as part #7 but not showing up,just 6 and 8,skipping 7.
At any rate,I would think the bearing race grooved it.
I would recommend reversing the ends and see if that works.
Clean up any rough edges and I think you would be good to go.
The bearing sizes are:
Sprocket side,6204-2RS
And 20x47x14 for the other side.
Good luck!
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AMA 487807A
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