Pella Sliding Glass Door Latch

A quick learner from Akron, OH says:
I am looking for the latch hardware that goes inside the door jam for a Pella sliding glass door to allow you to latch/lock the door from the inside. I have additional photos if you need any more pictures. I am trying to see if you can help me verify that your part #89-003 is a suitable replacement. I am in the process of selling my house and having a hard time getting a few repairs done. I will be submitting another request for window ventilation stops.
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Bob from SWISCO responded:

The mortise lock looks like our 82-218, in which case the 89-020 or 89-021 Keepers should work for you. Look at both and see what you think. 

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