where can I get the 3rd brake light from?

Hey guys, I have been looking for the 3rd brake light for my new S-281 wing for the Cobra and I have not been able to find crap . Can someone tell me who sells them? I got the wing from Downs Ford and the light did not come with it, and it never crossed my mind until today, im going to try to get some info from them Saturday, but it is not listed on their web-site so I dont think they cary it anyway. HELP