don't blame it on the young'uns, you won't find any cross reference for a direct, exact match of roller bearings for the ball bearings, even at a dedicated bearing supplier .... and I don't think there's any "Made in America" with close enough dimensions
check out these: Inner - MBS #909052R .... Outer - MBS #909001R [or MBS #909067R] ... seal might be National #6064 ... search for roller bearing discussions, these are some of the numbers that have been discussed before here a number of times, the fractional dimensions are not an exact match, but supposedly "they work" .... that said, roller bearings are not an "upgrade", they are a modification that you can hope will work as well as the original roller bearings and that are needed if changing to disc brakes
Bill
