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Lauren from SWISCO responded:
February 6, 2024
Hello, thank you for posting, Your handle set resembles the 82-089 style that has a 3-15/16" installation hole spacing from center to center. We also carry the 82-086 keyed version. Compare to your original to confirm a good fit! If the thumb latch is not working properly, it could also be an issue with the mortise lock. I would recommend removing the handle set and inserting a slotted screw driver into the lock to try to throw the hooks. If it is not engaging, you may need a new lock. Please review the style and dimensions of the 82-260 mortise lock to see how it compares to your original. Let us know what you think and if you have any additional questions! 
Alternate image for 82-260
Alternate view of 82-260
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