replacement door lock

A quick learner from Crawfordsville, Indiana says:
I thnk part 10-556 may fit the lock on the restroom door.The restroom at the Museum were built about 20 years ago and no maintenance documents can be found. No markings can be found on the remaining door locks. Just thought i'd get your opinion before ordering the part.
We are a non-profit Museum and have tax exempt status so we'd like to get that information to you when ordering the lock.
Thumbnail of the uploaded file named restroom door lock.JPG
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Dave Sr. from SWISCO responded:

Your internal latch looks similar to the 10-563 . We recommend either the 10-556 or in your case you might need the ADA compliant handle 10-557 . Review both parts and let us know what you think. 

How to install the 10-556 lavatory knob assembly.
How to install the 10-556 lavatory knob assembly.
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