I have not lived in Los Angeles since 1951. However, at that time there were several ball bearing manufacturing plants. Try the web.
One of my father's secretaries married a man who started manufacturing ball bearings in Glendale, CA. I know it became a very large concern. I just mentioned this because it shows that there are ball bearing places outside of the Big Cities.
Just figure that you are going to spend some time and play detective on the web.
First of all you have to be smarter than the machine.