Took my stuff apart so long ago can't remember. 75 duster calipers are the clip and bolt retainer style if it makes a difference. Do the calipers hang off the front or back ? I'm seeing pics both ways.
Front, is the factory location.
But, as you have noticed, they can be hung to the rear by changing the spindles and calipers from side to side.
And then using a brake hose from an Aspen or Volare has been well known to work.
Your choice, in however you want to mount them.