Larson Mortise

A contractor from Massachusetts says:
I can't seem to find an exact match for this mortise. It says "Larson" on the face and also has a small "JI" engraved on one side of it. The face plate is 8 3/4" long and the body is 5 3/4" long and 2" deep. Please let me know if you can identify this piece, thank you!
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Emily from SWISCO responded:

Hello!

Take a look at our 40-198 mortise latch and the mortise that comes with our 40-211. I'm afraid the 40-211's mortise is not sold separately but review the specifications for these parts and compare them to yours to see if one of them matches up to your old part. 

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