The bronze bushing is available just about everywhere.
All the 221-260-289-302-351 engines use the same part.
You can even get it from a speed parts shop under the Moroso brand, Lakewood, and just about any of the other clutch manufacturers.
The part you were trying to remove is called the bearing race.
Bearings are not a great idea in an application like this. The bronze bushing is safer.
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