Tom from SWISCO responded:
March 20, 2023
Hello! Thanks for reaching out to us. Your old mortise lock appears to match our Pella brand 40-191. Is this a Pella door? If I'm right, then my top recommendation for the keeper would be the 40-191S. This was specifically designed to work with the 40-191. Look it over and see what you think! Dimensions for 40-191S
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