Replacement lock or door handle lock system for CertainTeed slider

A home owner from Brandon, FL says:
i have a CertainTeed locking slider and have to change the key lock due to a divorce. I'm being told locksmith can't rekey need to replace lock or whole handle system completely but door is 17 years old. Marking on door says 20-50-629 but can't find any other paperwork to describe door. Do you have a replacement "key" lock or do complete handle with lock set?
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Tom from SWISCO responded:

This is honestly kind of a weird setup. This is obviously a sliding patio glass door, but that key lock looks like it's for a storm door. See our 40-123 for an example of what I mean. This might even work for you, but I honestly have no idea. I'm not familiar with the handle set you show in your pictures.

Look over the dimensions we show for the 40-123 as reference and let me know how yours compare. Could this be something you can use in your door?

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