Yeah Dave while they've probably never found their way onto a cobra or Daytona they do look the part. I have seen them on a few 40's though and in a 15 they are the goods.
Locally the only thing that even comes close for me is the DB51 painted by Dragway.
The benefit of these is that the look automatically says Cobra (I don't like the logo on the spinner though) which helps with identification I guess. Not a lot of Daytona's around these traps. And with the AUD going down down down they start to get competitive in pricing.
I'm reluctant to do the knock on adaptor thing. For authenticity its hard to beat but its hard to justify on my car when inside my car its all digital and modern. I'm still unsure of legality but if I'm not chasing that set up I don't need to worry as such.
Matt