Dude, the Nissan, SKF and Timken bearings are all over the web for under $40 and any half decent parts supplier should be able to source any of them with all the part numbers in the first post...
Search better or find a better parts house.
I can't speak to the specs on the National bearings. If they cross only to the ones listed, they are probably the same. If they also/only cross to the stock bearing, they are probably NOT the "upgraded" bearing.
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I am a Commodore PET --- Now get off my lawn you kids...
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