http://www.akerlychilds.com/
Clevite series bearings.
http://www.kingbearings.com/advantages.html
A very good alternative and on the fast side.
There is alot of black majic in bearings.
One thing to note: On ALL rod bolts keep a log of free standing length. When new go to full stretch (not torque) in specs 3 times. (Usually 2 of these are during the resizing process.) If free standing length changes over .001 at any time crush threads with a hammer and discard ALL of the bolts. You are very likely already doing this. If not you will be astonished at your findings in batch to batch metalurgy/strength/Rockwell ratings.