I always got my NSR wheel bearings from King Bearing.
Don't think they have a website, but they have a phone. That and your going to need to talk to them anyways.
Get the numbers off the side of the bearing and call them. They always got mine in a couple days.
King Bearing Inc
57 Hangar Wy
Watsonville, CA 95076-2460
831-722-0243
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Charles Gallant