Anderson Tilt Windows - Storm Window Fastener

A home owner from Northford CT says:
My home has Anderson Tilt Windows from the 1960's or 1970"s. The windows have storm window inserts that are held in place by four (4) fasteners. Each fastener is attached to the frame of the window using a small screw. The picture of the fastener is shown above. I am looking to replace about 64 fasteners. Does anyone know where I can buy them? They are not available anywhere I've looked.
Thumbnail of the uploaded file named PXL_20230709_235803472.jpg
Thumbnail of the uploaded file named PXL_20230709_235739002.jpg
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Emily from SWISCO responded:

Hi there!

Thanks for reaching out to us. Our 70-053 flush clip looks similar. Take a look at the specifications and see if this matches what you're looking for.

Alternate image for 70-053
Alternate image for 70-053

A home owner from Northford CT says:
Emily,
Thanks for finding an alternative clip. My concern is that the clip may not be rigid enough to secure the storm window in place. Would it be possible to tell me if the nylon material is more pliable than rigid?

Thanks,
Bob
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Emily from SWISCO responded:

I'm not sure I understand the question but the 70-053 is not pliable, unfortunately. I am very sorry that we can't offer something more suitable. 

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