You can find bearings by looking up your local machine supply store. You should have one locally if your town is big enough. I typed 6003 bearing into google and had lots of hits. Best seal for bike should be 2RS.

6003-2RS - rubber seal
6003-ZZ - metal seals
6003-OPEN - no seals

Speaking of bad things, how are the Viscount hubs? I have an old 36 spoke front hub I just rebuilt the sealed bearing in and was curious as to if I should use it or not.

Tom