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Casey from SWISCO responded:
September 29, 2023
Hello, We'd be happy to help but we can't be sure of the correct replacement without seeing the original mortise lock. The assembly shown in your photo reminds me of the 82-218 or 82-223 at first glance but you would need to compare the specifications of both options to the door opening and installation holes. 
Profile view of 82-218
Opposite side view 82-218
Alternate image for 82-223
You also mentioned that the mortise lock is attached to another housing, which could be a faceplate. If so, feel free to get back to us with photos of the mortise cutout in the door to determine if one of our mortise options with a faceplate might be a better option. Also, keep in mind that these locks have a 45-degree keyway that accepts the thumb latch from the internal handle. If you need a new handle set as well for this repair, take a look and compare the 82-030 handle set with 3-15/16" installation holes to the original. Thank you! 
Hole center dimensions for 82-030
Dimensions for 82-030
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