Since I am restoring this bike, what I am really looking for, if I can find one, is a traditional cup and cone part. I found some interesting info in regards to symmetrical/non-symmetrical cup & cone bottom bracket axles at Sheldon Brown's site here:

http://sheldonbrown.com/bbsize.html#japan

My bb isn't completely worn out (yet), so I have time to look around. If I can't find a traditional one, then I'll update to something more modern. Thanks.