Slider door keeper/lock mechanism

A quick learner from Billerica Mass says:
The lock mechanism does not work properly. I'm showing the identical working one in our upstairs sliding door. Would like to replace the locking mechanism in the door and mount.ca. you tell me which parts I need?? Thank you
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Casey from SWISCO responded:

Hello,

Your handle set looks like a match to the 82-078 shown below. Unfortunately, the mortise lock and keeper are unavailable to us. We apologize for the inconvenience but please let us know if you have any other hardware questions. Thanks for posting. 

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Alternate image for 82-078

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Alternate image for 82-078

How to maintain a sliding glass door
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