It IS.... and it isn't. Exactly....
The bumpers are actually faded badly which tends to throw people off on the rest of the color. The paint used in the louvers is actually NAPA based with the true matching color code of the Supra for that year, BUT there is a large amount of METAL FLAKE in it (for some unknown reason it was the only was to get that particular color...). The metal flake also throws off the look of the color depending on how the light hits it, making it look either brighter or darker from the rest of the car.
Of course, as nice as that paint looks, I forsee doing the entire car that gunmetal color with the flakes in it. Its really sweet up close and personal.
And as far as rear louvers are concerned, yes they WOULD look good, but they are exceptionally heavy on the glass. That's why a good sunvisor would set those off perfectly and not be so weighty.