My '72 uses '74-'76 Dart calipers AND hoses, AND swaybar, and they install as easy and same place as stock.....Jesus, Dr. Diff loves to over-complicate his stuff.
He’s set up to do conversions. He offers several options depending on how your car is set up. That’s not overly complicated, it’s good business. And how complicated is it to click a box on a web page? Sheesh.
And you use a ‘74 sway bar with a ‘72 K frame? Or are you not telling us everything? Because you have to switch the location of the calipers if you use 73-76 brakes with a 67-72 K and sway bar (unless you shorten the end links, which is another option).Which requires longer hoses. Which is why there’s more than one option.