70-72 vs 73 cooler lines

I have a 73 Scamp with a 72 340/727 and I’m wanting to get new transmission cooler lines. I had to swap the original slant 6 radiator for a V8 one with the driver side inlet and the used one I got I have no idea what year it’s from. I see Mancini and in-line tube shows a different part for 70-72 and 73, does anyone know the difference? Idk if the body is different from 72 to 73 or the radiator.