Nami-302187 Nfrc ADW-M-400 what part do I need? Lock set

A home owner from Lexington, KY says:
Nami-302187
Nfrc ADW-M-400

Not sure witch part I need, super big sliding glass door. Top "locking arm" would not unlatch. Part feel into door when I tried to remove and I can't retrieve it.

Thank you.
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Emily from SWISCO responded:

Hello!

It's hard to identify what you'd need without the original hardware but we can offer an educated guess. The cut out in your door reminds me of our 82-260 and 82-265 mortise locks but you'll need to compare our dimensions with the space available in your door to see if one of them matches up. 

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