Tom from SWISCO responded:
March 16, 2023
This looks like a math for our 82-239 mortise lock. Review our dimensions and see how well they match up. This particular mortise is also compatible with about a million different handles. It doesn't require anything special, but without seeing the original I can't say for sure what will work. Do you still have the original? If so, you can reuse it. If not, a common pairing is our 82-030. Review this product, as well, to verify that it will install on your door. Alternate image for 82-239
Hole center dimensions for 82-030
Dimensions for 82-030
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