10-556 vs. 10-562 ?

Both of these knob assemblies are made to go into a certain latch in the bathroom lavatory door. You will need to remove the existing one from our door to see how your handle attaches to the lock. If you want, you can send us some photos of the handle you now have and a photo of the latch with the handle removed for us to help you identify what part you need. Keep in mind that you cannot remove this kind of handle without damaging it; once they're connected, they are meant to be connected for good.