Sliding door latch

A quick learner says:
I'm needing complete latch set but the other part fell down into the door. It had a key that opened it from the outside & yet locked on the inside. This part in picture is 41/4" long.
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Emily from SWISCO responded:

Hey there!

Start by taking a look at our 89-017 keeper and carefully look over our dimensions to see if this matches what you need. As for the other hardware you need, can you show us some pictures of that? 

Thank you!

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