Right off the bat I thought, "1969 Barracuda taillamps flipped upside down" but I expect they're too large for the spot. The shape's nearly perfect, though. Nothing else comes to mind immediately, though, other than something custom. To my eye, you've got to find something that works with that shape. Cutting and grinding plastic sucks, but maybe if you start with something large (3rd-generation GM F-body springs to mind) you could figure out a shape cut the lenses to size. You won't have a perfect, ready-made housing but the housing doesn't have to be perfect, just a little smaller than the lens itself--nor does the shape have to be exact.