Sure, no problem. There might be some after market tail lights that have the amber on them, but I'm not sure. I'll look in on it for you(I'll do it later since it's 5:30am here and I'm going to bed). I'll also try to see if I can find some cobras for you. Worst case, maybe you can get a decal that's amber in color and place it over the white area?
Anyways, welcome to the board and post up a picture of your stang!
then wire the back-up lights into the turn signals....and on a dark evening in a obstical of garbage cans and fence posts you bust out a tail light because you've got no back-up light..man haha..glad it's not my problem.
Find out the fine for driving without rear amber blinkers...if it costs half as much as a set of Cobra tail lights, I say bite the bullet and cut the check for the Cobra tail lights...plus they look cooler in my opinion..i dunno...