Need replacement

Hello,

I would recommend starting by comparing the specifications of our 82-218 mortise lock to yours. Take note of the 45-degree keyway shown in the image below that the thumb latch would engage with. Carefully compare the measurements below to confirm that they match, but I suspect that they will. 

If you have any concerns about this working, feel free to get back to us with photos of the handle set that engages with your mortise lock to confirm if our assembly would be compatible. Thank you! 

Opposite side view 82-218

Profile view of 82-218