Keyed Lock Needed for Sliding Patio Door

A handy person from Massachusetts says:
A client wishes to add a keyed/locking cylinder to the handles pictured. There were no names on the door or hardware.
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Tom from SWISCO responded:

Hello! Based on these photos, I believe you can use our 82-315. This should be fully compatible with your existing hardware. The video below will show you how you can install it on your existing handle.

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