There was a discussion here recently about converting to roller bearings, part numbers and all...
Using numbers found here I had ordered some from my local parts guy for my 56 but they didn't fit. Decided to order them from Chevy Duty (still had a store credit)... put them in last evening and they fit great.
For reference:
Part # off of the bearings themselves so you can try your local supplier:
Inner w/race: 909052R
Outer w/race: 909001R
Mfg is MBS (Japan I believe)
