Since 22 mm is 7/8", you might try getting some generic rebuild bits from your local parts store. I popped for a new m/c last time, but may try that route in the futue.
Positive! I am looking in my OLD Columbia Motor Corporation catalog and it lists SP 9000 for Dunlop cars. It is a 7/8" bore. I will check to see if I have some in the next week (a LOT of COMPLETELY unorganized 'things'...).
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