4428J Dupont is what you want. My local Dupont dealer has an old paint chip book. I selected a black interior paint chip from the 67 Dodge section and recieved a 4428J (Dupont).

It comes ready to spray or they can put it in a aresol can. It is pretty pricey though. I pay somthing like $80 for one quart. It looks very correct.

I also noticed SEM Trim Black looks very close to 4428J (Dupont).

Good Luck