Paint stripes for 1973

I have a 1973 Dart 340 sport. Its red now but was black originally based on TX9 code right? My question is that it has a black stripe that starts up front and turns up before rear wheel wells, that meets on roof. I understand that was not an original deal for that year. If so, what was if anything? Wondering what options there was that year on a black car. Thanks. If needed I'll post pic.