I have found 3 different Bearing sizes for the same spindles, so you don't have much choice, unless you have the manufacture of your spindle, it would be a guess to know the exact bearing numbers, do you have a 4 bearing or a 3 bearing spindle, they can all look, just the same
Make sure you have all the right tools to take it apart, any damage to the main rotating parts will render your spindle as Junk, everything is balanced, so care is needed, the Nut at the top of the spindle is left hand thread, and can have Loctite on the threads, so can be hard to remove, with out the right tools, same as the front Nut, it is easy to damage