Lock need to be replaced

A quick learner from Florida says:
Help please! I really need to replace this lock and have no idea where to start or if a replacement exists anymore
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Bob from SWISCO responded:

I am afraid we don't have a handle set like this. I suggest you consider replacing it with a surface mount design like our 82-005. Look it over and see if you think you could adapt this to your door. 

Reversing the thumb lock on the Swisco 82-005 Sliding Door Handle
Reversing the thumb lock on the Swisco 82-005 Sliding Door Handle
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