An 1/8" bigger would be in the neighborhood and probably easy to find. A 1/16" bigger would be good for a finish cut but might be harder to find, especially in larger sizes. There might be an easier way and that is to add a shim to your fence. One of the advantages of movable faces is that you can loosen them enough to drop a shim plate between the fixed and movable portions. You can also just clamp something to the face but something really thin might be hard to keep flat. Something like 1/8" masonite would probably work pretty well. That would be a lot simpler than changing bearings.
Slipping a rub collar over the stock bearing might also be an option if you can find ones with the right specs.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.