Adding an external lock to existing hardware

A quick learner from bethesda, MD says:
I have an existing sliding glass door (pictures attached) and I'd like to either add an external key lock to the existing hardware (there is a punch out?) or replace the hardware with a compatible door lock that has an external key.

Lock is double mortise with the hooks facing inward, windows in the house are pella, but I couldn't find any markings on the door. I like the style of the existing hardware, but would be fine with similar.

Homeowner, quick learner, should be able to do the installation myself.
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Casey from SWISCO responded:

Hello,

Since your external handle has a punch-out for a key lock, take a look at the 82-310 and the related installation video to help you through the process. Ignore the key lock housing shown in the video, which your handle does not require. Thanks for posting! 

How to Install a Key Lock on a Patio Door
How to Install a Key Lock on a Patio Door
VIDEO
WATCH >
How to maintain a sliding glass door
How to maintain a sliding glass door
GUIDE
READ >
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