Go to an industrial bearing dealer with your old bearing. They will more than likely have one that is exactly the same. Be sure to tell them what its for or they may try to sell you an expensive very high speed, high load bearing.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1