CD8A CD8B mortise lock

A quick learner from Toronto says:
Hello, i am looking same this type of mortise lock for my sliding glass door. I don't know the brand of door, but lock as CD8A and CD8B stamped on the inside, please help me to find this lock, Thanks
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Emily from SWISCO responded:

Hi there!

This looks very similar to our 82-251 but compare our dimensions with yours to confirm this matches up. 

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