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The Leslie lower bearing used to be NTN 6200-LB at least on many two-speed Leslie models. (McMasterCarr 5972K41 ?) (10 mm bore, 30 mm diameter, 9 mm thick, non-rubbing rubber seals). The original bearing is no longer available from NTN.
As replacements, types 6200-Z or 6200-2Z (for example from SKF) will work, also on a Tallboy Leslies (31A, 31H, 31W). The Z models have non-rubbing steel shields. Avoid 6200-2RS, as it has rubbing rubber seals, which sometimes causes too much friction, especially when a motor controller (to convert single speed Leslie to dual speed) is used.
The lower rotor bearing should include a 5/16 washer in between the wooden rotor and the bearing.
The upper bearing used to be MRC 35FF (5 mm bore, 19 mm diameter, 6 mm thick, two shields). SKF 635-2Z is equivalent. Again, you want to get one without rubbing seals!
On a Leslie710, you can replace both bearings with ball bearings from FAG. Type 6200.2RSR. Ball bearings are standardized industry parts, so a second source type is no problem at all.
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