how to measure the latch

A quick learner from NY says:
May 20, 2021
i need the latches for my elongated screens but i don't see the size. here is a picture of the latch. can you help me in ordering the right size
Thumbnail of the uploaded file named webcam-5/20/2021, 3:41:36 PM.png
Thumbnail of the uploaded file named webcam-5/20/2021, 3:43:06 PM.png
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Bob from SWISCO responded:
May 24, 2021

Hello there. I believe this might be either our 70-172 or 70-174, but the only way to know for sure is to compare to the dimensions we list on the pictures in each shop page. Let me know what you discover.
Knife Latch Pair
Knife Latch Pair
70-172
$2.10
Andersen Screen Latch, Pair
Andersen Screen Latch, Pair
70-174
$3.87
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