I rec'd some Gorilla nuts lol with my Tenzos. They have held up very well for inexpensive ones. But they are a flat black. You might want a satin.
A forum Member, Nigelo sent me a link to wheels and lug nuts extravaganza from another forum. I had no idea how much cool stuff is out there. I am still trying to pick a new set. Got some cheapo blue ones also just to try out the color on my bronze wheels that are on my Cosmic blue.
I wish i could answer DaViper's q? though. If MazdaSpeed supplies them they would make sure you had the right nuts, i would think. So if i were to guess and i hate to do that. i would think the stockers would be fine. I seem to recall the difference is the radius at the point of contact with the wheel might be different but i am probably talking out my behind again. sorry for that