you have a 500 brake plate and a 500/550 cush drive setup, so order 500 or 550 rear wheel bearings.
the front wheel 500/550 or 750 wheel bearings...either will work.
In short, order bearings for your stock bike configuration, and you should be fine.
All Balls bearings are fully sealed, and are what I use.
With Lesters, tubes should be considered mandatory.
~Joe