I called last week and talked to Mansel at Southbend clutch. I asked him if Peter had gotten the Aetna T.O. Bearings in yet. He said yes and how many do you want? It came today and looks good. I also looked up the company, Aetna, and they have been around for a LONG time. Their bearing is a real stout build where the balls in the bearing are sandwiched between the two hardened grooved bearing plates. It is not somewhat tapered like the other bearing was.
http://www.aetnabearing.com/product-category/aetna-clutch/
http://www.aetnabearing.com/product-category/aetna-clutch/