Just make your own like Roy did there. It's easier than it sounds and they look totally custom. You just need some red lexan and L.E.D.s or a sheet of clear perf to back the red to diffuse the light like an o.e.m. light. You should be able to find a plastic supply shop in your area or try
www.keltechplastics.com and ask for some adhesive, red lexan, and clear perf and a little advice and some patience. Use a blade with lots of teeth per inch and some careful sanding and polishing and a little heat to give them the right arc and You'll have custom taillights.
The guys from Marquez Design might also be willing to sell you some lexan too.
If it's in the budget, some L.E.D.s would look super trick under the translucent red like a new car so you won't need the perforated stuff.
Good luck and be sure to share your results!