Extrapolating the production numbers from 66 I think I just got the single rarest combo that was availability(sans some COPO special order nonsense). 1966 Emberglo, GT, K code, Green dot automatic. She maybe the last of her kind as working the math there were only 15-30 produced with these options. That would put it up there with the 68 lightweight Cobra Jets and the 64.5 pace cars. She wears all her own metal and went through a resto in the 90s. She is perfectly imperfect and I love her. My rare girl. My other Mustang is a 68 GT500 Shelby and I love this car more.