Roller bearings for AVR2

[Griffin, Buddy]

Does anyone know a source for roller bearings for entrance compliance rollers on AVR2. They are stamped Barden SF4SS. I can't seem to find them on line. A cross reference to another manufacturer would work as well.
I am not able to remove one for sizing as the unit is being used as is until a suitable replacement can be found.

Regards,

Buddy Griffin
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