Mounting plate for Traco sliding door latch

A quick learner says:
Hello, I need the mounting plate only for a Traco sliding door latch.
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Casey from SWISCO responded:

Hello,

Your mortise lock resembles the 82-229, which is compatible with a handful of keepers. You can start by comparing the dimensions of the 89-020 and 89-021D to the projection needed to engage with your lock. Thanks for posting! 

A quick learner says:
Thank you! It looks like the right part.
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