NOS genuine GHE Tenax cabriolet cover snap with a 15mm diameter head on the top button.
As you can see from the photo of the different versions. You are buying the ones in the bottom row. The top row is Der Original Knopf and the middle is the 10mm head GHE Tenax.
All of these are separate listings.

Price is for one.

Tenax is now being made by a different manufacturer so it will be difficult to find these GHE originals.

Box110