I would expect a Ford part number to be 09B 7561 rather than O9B 7561 (number zero rather than letter "Oh"). A crude Google on that produces results for both a bearing and a hub for the bearing. The hub appears discontinued at Macs but available at Dennis Carpenter... The bearing appears available at several sources.
Sorry, I forgot to include the link to the Google I did. Interesting to see that doing the search now brings up this discussion as a result...
https://www.google.com/search?source...=1568593924523