Herman Miller Sayl Chair | Mystery Headrest?

So we found this unrecognized headrest for the Herman Miller Sayl chair on eBay and we decided to try it out. The result was surprisingly good! If you have any information about the manufacturer or the designer of this headrest, please let us know!
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[@OfficeLogixShop]

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[@user-ti7wt9iu4g]

It looks ok but not sure if it's really comfortable? Maybe you can give it away for free with your chairs? If enough people like it maybe you can tweak it or just sell it as is.