These are bearing numbers for 3/4-ton AND 1-ton trucks. The only difference between the two is that the later 1-ton uses a different seal than the later 3/4-ton. (1-ton seal numbers are in parens.)
'53 to '59
seal -- 5756 (40973S)
inner -- b46
outer -- b45
'46 to '52
seal -- 40973S (40973S)
inner -- b26
outer -- b25
A solution that works for a 1-ton is likely to also work for a 3/4-ton since they use the same axle and spindle.
