Going to keyed door handle set

A quick learner from USA says:
I'd like my sliding door handle to be keyed on the outside. What do I need?
From what my guy measured, between the two screws on the door handle measures 4" and 6" for the locking mechanism that goes inside the door.
Let know other wise
User submitted photos of patio door hardware.
Profile picture of Paul
Paul from SWISCO responded:
Do you only need a key for this handle set? If so, look at our 82-306. As long as the measurements match you should be able to use this to replace your old exterior handle.
A professional from California says:
I could be wrong, because from the angle of the picture I can't tell exactly, but you may be better off getting a 82-310 and drilling out the hole in your handle for the cylinder. It looks like your outside handle already lines up with the lever position. 82-306 does not have the screw posts to line up as yours does. I would take off the outside handle and make sure. Look at the screw holes on the page for 82-306 to see if they line up.
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