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I looked into manufacturing them so I could sell them on ebay for less than Porsche does... they are not stamped with a patent.
However, the molds are 5-10k each and then runs of 500 sets would be required to get the unit cost down.
And that's why no one has created aftermarket roll bar inserts. The market is too small for this kind of outlay.
I toyed with having stamped aluminum pieces made, but got brushed off by too many machine shops to fiddle with the idea any longer.
They do make a lot of difference in air moving through the cabin and if I were you, I'd buy some off ebay.
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