45-year-old storm aluminum self-storing storm window

A home owner from Rochester, MN says:
They are coming apart at the corners and there seems to be no way to re-attach them. Except duck tape, which isn't working very well.
Thumbnail of the uploaded file named bottomOFframe.jpg
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Dave Sr. from SWISCO responded:

Thank you for reaching out to us. I'm afraid we don't sell replacement windows or frames. Are you looking for the corner hardware? If so, we will need to see photos of them removed from the frame along with the written-out dimensions. 

A home owner from Rochester, MN says:
Well, these storm windows do not appear to HAVE any corner hardware. I am attaching a picture of the bottom piece of the frame that fell off. There is no corner hardware. Nothing remaining on the vertical piece of the frame that is still in the window. The frame is 24 inches wide. I don't know what other dimensions you would want.

Same problem with the insert. That is a different window and that one is 21 inches wide. I have already duck-taped that one, so I'm attaching a picture of one that has NOT fallen apart, so you can see how the corner looked before. No corner hardware.
Thumbnail of the uploaded file named image.png
Thumbnail of the uploaded file named image.png
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:

I actually see a corner key in your first photo here but I'm not able to identify it when installed. Seeing it removed from the window along with the written dimensions of the corner itself is the only way I can help. However, you're more than welcome to browse our selection here

If you aren't looking for the window hardware then we can't help, unfortunately. We can only assist with identifying unknown parts. I am sorry for any inconvenience. 

How to replace stamped window corner keys.
How to replace stamped window corner keys.
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