Need a keylock latchset handle for a sliding door

A quick learner from Rapid city sd says:
Door is +/_ 1985 pella wood slider. No records or more. I'd # on door.
Need exterior key lock function, didn't previously have.
Notes: 1.
door thickness 1 13/16"
2. 4 9/16" mortise lock single latch
3. Handle frame is 6 3/4", 2 screws
Have photos
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Casey from SWISCO responded:

Hello,

We'd be happy to look into this for you but we would need to see a straight-on photo of the pull handles and confirm the exact distance between the center of the installation holes. Thank you! 

A quick learner from Rapid city sd says:
The interior pull handle has a 6 3/4" dimension between mounting screws (cl to cl)
The exterior pull handle has no exposed screws and measures +/_ 7 1/2"
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Casey from SWISCO responded:

Unfortunately, we do not carry a keyed handle set with 6-3/4" installation holes. If you haven't already, I would recommend contacting Pella directly to discuss your replacement options. 

I'm sorry that we won't be able to assist with this repair but please let us know if you have any other hardware questions. Thanks for posting. 

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