There are a couple of threads around about the Gorilla brand one piece black lug nuts (I have a set), but I just stumbled across these:
https://www.roverjaguarparts.com/oem...black-c2d20073
They look pretty good I reckon, and they appear to be one piece nuts, but from the ad alone it's impossible to tell if you get 5 or 20 for the price. I guess it's 20, but if it's only 5 fergeddaboudit!

 

Seen these on an xkr , they look a mess, to much going on and then the growler center cap in the middle, no IMO

 

Yeah... not keen on that at all.

 

That's the price for the set of 20, but yeah it's just too much going on, IMO