I believe VP Autoparts sells them.
However, if you look at the race of the bearing you will find a number stamped on it. Usually on the side of the outside race; but, I have seen the number on the side of the inside race. Take that number to your local bearing vendor and they can probably set you up quickly. Depending on the vintage of your gear box it might be 6306
https://www.grainger.ca/en/product/p...E&gclsrc=aw.ds