Dart GTS Custom sill moldings question
I don't know where you got that information but M25 IS the standard "pencil" style molding. There was never any other style of molding for a 69 Dart GTS. Here is a picture of Dart moldings. The one on the left is for 68-69 Dart, the molding in the middle is the typical Camaro molding that everyone uses because they are readily available, the molding on the right is the later Dart molding.