Storm Door Latch Assembly

A home owner from Central Connecticuit says:
Looking for a replacement storm door latch assembly. No makings anywhere on door or parts. Very thin storm door as well as a narrow mortise lock. Thank you for help with this.
Thumbnail of the uploaded file named Narrow Mortise Lock .312 thick x 2.1 deep and 5.4
Thumbnail of the uploaded file named Narrow Mortice Latch Assembly - MFG Unknown.jpg
Thumbnail of the uploaded file named Very Narrow Mortise Lock Mechanism .312 Inches Thi
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Bob from SWISCO responded:

Start by looking at our 40-211. Carefully compare our dimensions to yours and let me know if anything differs, and if so, how. 

View of 40-211 Mortise lock
View of 40-211 Mortise lock
Alternate image for 40-211
Alternate image for 40-211
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