I had smoke tails on my MIV and never got bothered for them being all black. I think all that matters is that they light up with the right color bulbs. I'm not sure how the people giving safety will think about that though.
Looking at some black tails, but are they legal in Hawaii?
There's the product link. Not totally serious about them, but curious if I'd even be able to use them without being pulled over every 5 minutes...
16v Turbo MK1 Cabriolet
As far as Kauai goes on safety inspections anything applied on the lens "diminishes" the light output and would fail inspection... But thats just what Kauai DMV director tells us... Remember that not only do they have to light up red but if the red reflector is in the lens then it must reflect red easily also..