Hi dbrinch.
The size of hands (or more specifically, the hand post length/diameter) you need very much depends on the type of movement you have.
If you have a 21J-based PO, then your best bet would be to replace the hands with either those salvaged from another 'donor' 21J PO, or ask your dealer really nicely if he can get some for you. Equally so if you want rep hands for an ETA or clone-based movement.
If you have the dollar to spend however, and you DO have an ETA/clone movement, you could always go for gen hands, which may be overkill for your needs, but may also prove easier to source than just rep hands alone. Good luck!