What type of Knob Assembly

A handy person from New Hampshire says:
What type of knob do I need. I have posted pictures of the one that has a missing knob and the other one that still has a knob. Thank you.
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Tom from SWISCO responded:

This looks very much like our 10-556 stall door knob. I recommend looking over our photos and dimensions to confirm, though. The video below should also help you.

A handy person from New Hampshire says:
This is not the correct part. I did purchase one and it did not fit or work. Subsequently, I found Accurate old style knob assembly will work.
How to install the 10-556 lavatory knob assembly.
How to install the 10-556 lavatory knob assembly.
VIDEO
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