I am sure this has been covered in the past, but what is a source for 239 cam bearings  I am trying to help a local shop out as they thought all Y blocks are the same.. I know 239s are different but never paid much attention to building one

Should have been clearer.. Are all the bearings in the early engine the same OD?  A local shop has an engine that the two middle bearings are .020 bigger OD that the other 3..