Large patio door

A handy person from 45 w grand ave Lakevilla IL says:
I am missing the lock mechanism for my 8 foot patio sliding door. I sent you for photographs hopefully you could identify the proper parts. Thank you
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Tom from SWISCO responded:

Hello! Looks like you've got an Andersen brand door here. With that in mind, I recommend the 82-043 thumb latch and 82-037 mortise set. I think these parts will work very well for your door. Please let me know if you had any questions about them!

A handy person from 45 w grand ave Lakevilla IL says:
These are the right parts for sure, however there are the same holes on the the other side of the door as well, probably for a locking mechanism. Is there a part like that available?
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Tom from SWISCO responded:

Sure, that would be either the 82-316 or 82-317 , depending on what side you need. Handing for these key locks is determined from the outside looking in, based on the operating door; if I'm looking at your photos correctly, then the operating door is on the left, if I were standing outside. That means you want the 82-316 .

Please correct me if I'm wrong about handing. I haven't had breakfast yet so my eyes could be playing tricks on me!

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