Here are some of the cross ref numbers from the Cdn NSN microfiche.
Aetna A1570
Eaton K5756
Condec 01760-0011 , 1760-011 or 1760-0011
Rockwell 1228G267
Long-airdox, Rockwell, Condec 1828X37
Nice 6113
Chatanooga Boiler & tank co, New departure, condec 928
I posted these a while back when I sold my last set of 4 NOS bearings:
http://www.mapleleafup.org/forums/showthread.php?t=9587
The NSN 3110-00-158-6691 is for these bearings. There is actually 1 listed as part of a lot of parts being sold out of Montreal Supply Depot.