Not locking

A handy person from Folsom,ca says:
We replaced our handles a few years ago but now the locking mechanism isn't catching. We have the 82-069 3-15/16" sliding glass door handle set.
What should I purchase to fix this lock?
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Bob from SWISCO responded:

Thanks for posting. If the mortise lock isn't working, see our 82-227. Look over the dimensions to confirm it matches with your old mortise lock.

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