Sliding glass door lock

A quick learner from Kemp, Texas says:
SGD-R20. Series: 4000/4002/4003/4004. ANSI/AAMA 101-93.
MST: 12069.
This is as much info that I can find. We purchased this sliding glass about 26 years ago and the lock has broken. I am trying to find a replacement for it.
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Bob from SWISCO responded:

I am afraid we can't reference this to any specific hardware. Can you show us pictures of the handle set and lock in question? We'll do our best to assist you from there. 

A quick learner from Kemp, Texas says:
Thank you for your response. Let me know if you need more pics
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Tom from SWISCO responded:

Thanks! Please see our 82-218 mortise lock. I think this may be what you're looking for, but check it out and let me know what you think.

A quick learner from Kemp, Texas says:
It looks right. I've ordered it. Thank you for your help
How to install a Legacy Handle Set
How to install a Legacy Handle Set
VIDEO
WATCH >
How to install the 82-218 Mortise Lock
How to install the 82-218 Mortise Lock
VIDEO
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How to maintain a sliding glass door
How to maintain a sliding glass door
GUIDE
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