Dave Sr. from SWISCO responded:
December 7, 2017
I am not certain whether you are able to use our 82-226 mortise lock with the 4-5/8" mounting holes of our 82-227 with 5-3/8" mounting holes. Let us know which of the two would be the better replacement. There is also the option of reusing your existing,mounting plate and install our 82-218 into it.
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