By 69 the dart body style had basically been the same for 3 years and somewhat dated. Though I'm sure some changes were made to reduce costs It was also a Time when parts could be taken to the next level through molding that would cost a fortune to try to if you even could reproduce with metal parts my 70 grill is original it has held up extremely well it's amazing so questioning its integrity is somewhat moot. It is much more detailed and complex than any other dart grill before it in my opinion. Also the tail lights in the bumper was the trend that Mopar had moved to just look at the super Bee for 70 roadrunner for 71 and some as mentioned do not care for the tail light in the bumper look ok but the trunk deck how it marries to the bumper looks really good compared to previous years.