Around the 73 model year Mopar slider disc brakes came out on A bodies and were mounted to the front.You can swap the spindles and mount them front or rear.
1965-72 A body Dodge Darts, Plymouth Valiant's, Barracuda's, has disc brakes on them, and they are mounted towards the rear.There were no disc brakes in 1965 for Chrysler vehicles.
You can swap the spindles and mount them front or rear. It's just a mirror image.
Aftermarkert brakes ... hell, anyone can do that !!I mounted mine to the rear to avoid replacing the hard lines, hose routing has not been an issue.