Jasmine from SWISCO responded:
October 12, 2023
Thanks for posting! We do have a replacement for the thumb latch you have here, however we do not sell it in the satin nickel color you handle set is made in; it is only available in white and it is part 82-107. Which means, you would need to replace the entire handle set. We have the 82-090 available in satin nickel and there is also the 82-089. These are both the non-keyed version of our Legacy Handle Set, like yours. The compatible internal lock appears to be the 82-226 4-5/8" Mortise Lock. Take a look at the dimensions to see if these parts may be a fit for you. Alternate view of 82-090
Alternate image for 82-226
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