My 70 Dart was originally a white car with the green interior and very dark green vinyl top. I ended taking the top off and using a black stripe, but the original top was so dark that I think it would have been fine with the black stripe
A friend bought a 70 Dart Swinger 340 several years ago. The body turned out to be too far gone to restore, but when we decoded the broadcast sheet it called for a "translucent green stripe".
I just finished a 70 Dart GT and wanted a metallic grey stripe to match the interior so I went to Phoenix Graphics and they were happy to make 70 Dart stripes in any 3M color that I wanted. They sent me 4 different metallic Gray to silver swatches and I picked one. I think they charged me 25% over a standard color (an extra $30???)