I think noone offers them because most people who change lugnuts also change wheels, and very few OEMs use our style of lugnut.
As to why Nissan uses this style lugnut on the 370 and GTR, its only speculation on my part, but they do offer more surface contact area so probably hold a little better. Either that or Mr K's grandson owns an odd shaped lugnut factory.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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