Even though they're listed for Buick axles, I'll bet dollars to donuts that the Buick axles are the same as Chevy, at least in the bearing race area.
Good info. The Rear Axle bearing PN for 1/2 ton Chevy trucks is NATIONAL R1502EL Their PN for the sleeve is IR 1502 (with IR standing for Inner Race?)

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.