Surface mount with a mortise

A home owner from Washington State says:
mounting screws are 4-15/16" apart. Let me know if you need anything else.
This is my summer place and I will be going back up there this weekend if you need any info. I did look for any markings or numbers and did not see any.
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Tom from SWISCO responded:

Thanks for posting. Based on your photos, I would recommend our 82-032 handle set, 82-218 mortise lock, and 82-310 key lock. Look them over and see what you think. I'm less sure about the keeper, but start by looking at our 89-017.

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