i haven't heard of anything like that, but i'm sure if you get one with some extra space in it you could mount some red led's in the back of it to use. not sure how legal it would be though.
you could always get a 3rd brake from a car that has is in the rear window and fab that to go in yours. if your windows are tinted then you won't really see it from the outside until you hit the brake.
2010 Volvo C70
2011 Harley FLHTK
Midwest Crew #22