Dupont had two formulas for plum crazy, one more violet the other lighter. The more violet was Alt.2 which matched the original on a 71 Demon. When these cars were painted originally paint was supplied in large batches and there was some variation between the batches as supplied. If at all possible get a camera read or an original area which will generate a formula that will match. Just dead nuts matched K5 using this method. Used Lesonal,(Sikkens). With new air quality regs waterborne will be taking over so it's a new ballgame. As I remember it real plum crazy was more violet and yes I was painting them back then but each of us sees color differently. Oh the magic of eyesight!!