Want to install keyed lock for this door, can you identify the proper lock to purchase?

A home owner from Makawao, Maui, Hawaii says:
I have attached 2 pictures of the handle installed and 2 pictures of the handle removed. I believe this is a Milgard slider from around 1992 but I could be wrong. Can you help me get the right lock for this door.

Thank you very much.

User submitted photos of patio door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Take a look at our 82-021 patio door handle set and see if this could be the one you're looking for. Just make sure the dimensions match up with your handle.
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