larson storm door latch

A quick learner says:
i need a door latch for larson door...34660102 121??0620 (question marks mean numbers not readable...
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Tom from SWISCO responded:

I'm afraid that code doesn't tell me anything about the door you have or the hardware it uses, especially since some of the digits are in doubt. In order to assist you, we will need clear and unobstructed photos of the handle set in question. I can then check our inventory to see if we have a match.

A quick learner says:
Please see attached photos.

these are the numbers I have:
34660102
121??0620
Thumbnail of the uploaded file named 20230326_135449.jpg
Thumbnail of the uploaded file named 20230326_135500.jpg
Thumbnail of the uploaded file named 20230326_135519.jpg
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Tom from SWISCO responded:

Thanks! This looks very similar in design to our 40-198. Review our dimensions and see how well they compare.

Alternate image for 40-198
Alternate image for 40-198

Side view of 40-198
Side view of 40-198

How to flip a storm door mortise latch.
How to flip a storm door mortise latch.
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