Dart 72 vs 73 susp dilemma

Take some pictures and post them and we'll be able to tell you what you have. The 1973 and newer stuff is better than the older stuff so the more of it you have the better. I converted my '72 Duster all over to the '73+ stuff since it works better. The anti-sway bar is tucked inside the K frame where it should be, the late model knuckle uses a larger wheel bearing, the late model brakes are a better design, the spool mount is a better design than the pad mount, etc.