Seeking to replace the inside and replace the outside with a keyed entry.
A handy person from Pennsylvania says:
March 16, 2020
The interior handle mounting screws are just under 5 inches apart and this is a surface mount lock. The objective is to make the exterior a keyed entry.
Casey from SWISCO responded:
March 17, 2020
Hello,
Your exterior pull has a punchout that should accept our 82-310 key lock. Take a look and let us know if you have any other questions or concerns.