1970 vs 1971 Dart bumper, which looks better?

Dan, do the 70 bumpers use a different electrical connector than the '71-'73?

Pretty sure it's the same, but I could be wrong. Either way, it's not hard to interchange. On each side you've got three feed wires (tail, brake/turn, reverse) and if your reflector/bulb holder housings are plastic you've also got a ground wire. Connect the correct car wires to the correct housing wires however you like -- don't use cheesy Scotch-Lock crunch-type taps, though; if you don't want to crimp and solder and heat shrink use Posi-Locks or similar.