Sliding door latch

A contractor from Vancouver wa says:
I have tried a few patches from the local big box store but everything seems to be just a little bit off. Any help is appreciated in identifying and procurement of a replacement.
Time is sensitive as this goes to a main entry door that iOS now not very secure.

Thank you very much.

Please see attached pics.
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Bob from SWISCO responded:

This mortise lock looks like our 82-218. It is supposed to be a snug fit; see the installation video below.

82-218 : Mortise Lock, Round Face, 3-11/16
Mortise Lock, Round Face, 3-11/16"
82-218
$10.92
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How to install a Legacy Handle Set
How to install a Legacy Handle Set
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How to install the 82-218 Mortise Lock
How to install the 82-218 Mortise Lock
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