1970 vs 1971 Dart bumper, which looks better?

Incorrect. The single '70 Dart tail/brake lights give higher objective performance than the '71-'73 items.



Incorrect. Those don't work; in fact they reduce the performance of the brake/tail lamps to unsafe levels. See here.
Dan, do the 70 bumpers use a different electrical connector than the '71-'73? I figured you'd know out of anyone