I just got what appears to be exactly the same caps in the mail yesterday. $19 for mine!
I replaced some ebay cheapos I bought a couple of years ago. The old set was always loose and and seemed like they would fall out. The NEW ones are VERY tight.
4x75mm Porsche Alloy Wheel Centre Caps Boxster Cayman Cayenne 911 Turbom HUB4309 | eBay