67- 69 share. 70+ will bolt into a 69 but have differences such as a neutral safety switch. 73+ will also bolt into a 69 but are a bit different in spring placement and also have a neutral safety switch which 69 does not.
There is also a difference in 67-72 between the standard pedals and the HD 340 and BB sets.
In my -68 dart I took the clutch pedal from an early pedal assebly and put it right in the -68 automatic assembly still in the car,it fitted right in, then I just cut the automatic brake pad to the size of a manual pad. i think the clutch pedals are the same between the early and the later assemblies, the break pedals are not.