No wonder I had trouble with that part number. This thing is older than zerk fittings. I finally found it in the instruction book for the New 4 cultivator (built from 1914 to 1924). The bushing is part number F253 and the hub that runs in it is 6002B. The part with the grease cup, that they called a "bearing" is 6000B. 2264B is the number of the shank. I doubt any of those numbers will do you any good.
I think all the bearing-related parts are tapered, making common hardware bushings unusable. I don't know if the later bushings, as original on the Cub etc. could be made to work or if the later bushings can even be found. You will probably have to make your replacement parts or maybe shim things to take up some slack. Then keep them well greased.