Correct Disc Brake Caliper for 68’ Dart

hemi71x said
Look to see if you have two calipers of the same side.
2 Righties.
2 Lefties.
Easy enough to look.

Did you check the calipers as Jim suggested above? In post #4, your bleeder screw is on the bottom. If they aren't now both at the top, you will never get the brakes bled.