Part # for correct front U joints at wheels

[Toro]

I need some help determining the correct front U joints at the wheels for a factory Dana 44 on my 72 Blazer. Using RockAuto search, there are three bearing cap sizes that show, 1.188, 1.125, and 1.062. These all show as Dana 44 front axle at wheel with inside clips, which is correct, but I'm not sure why there are three different sizes. If anyone has replaced theirs, do you remember a part number that worked? Thanks, Jon.