I know Autolumination.com sells colored bulbs, i think they might have chrome coated red bulbs as well.
And every kind of led third brake light i've seen can be had in smoke or clear lenses. No red until you hit the middle pedal.
What'd do, is get both those(or similar), and spray both with the same amount of coats of nightshade. To darken all of them up. Make it look all dark and ish. Keep in mind, you need red in the rear for taillights and signals. The taillights i linked, are for the old 3 bulb set ups(99 and older). I'd also wire in another brake/turn/tail plug and fill all three holes. (wow lol.).