Sliding Door Latch

A quick learner from Buffalo, NY says:
Can you help me find the part that goes into the "hole" for this sliding door latch?
Thanks.
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Dave Sr. from SWISCO responded:

I think we can! Please see our 82-263 mortise set and 89-017 latch plate. I think these are newer versions of your older door hardware. Let me know what you think.

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