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To predict bottle neck diameter at the holes I measured the gap on all of the ones I have and got an average to work from. Then I 3D printed several iterations of the neck and settled on one that enabled being able to snap on the metal fitting without stretching it. That being said, the wire assembly is bendable and can be adjusted for size, so it can be made to fit a range of neck diameters.
This picture has its own page with more detail, click here to see it.
These can be purchased on Amazon (larger quantities on Alibaba). Here are some views to show how they install on jars. These jars can be made by slip casting. Precise plaster molds of the jars and lids can be made using 3D design and 3D printing (using the techniques taught on this site).
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