Missing piece

A handy person from colorado springs co says:
This handle assembly is missing the flat, sliding plate that engages the keeper. I can't find any info on the door or frame, but I think it's a 1970s or 1980s vintage. I hope this is enough to identify it.
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Bob from SWISCO responded:

Thanks for writing in. This handle set looks like it could be either the 82-036 or 82-078, depending on the style of the hook. I am afraid we don't carry the internal mortise lock, and I am not sure if it's available any longer. I apologize for any inconvenience. 

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