If they're anything but 69 manifolds, they are incorrect plus they don't flow as well as the 69 models. .....but regarding the price and rarity, I can see where an original 440 car missing some would need these if they're nice.
The left side is 69 only and that is the part number listed above , the right side is 67-69 . the 68 GSS darts had the 67 383 manifolds on them which the drivers side is more restrictive than the 68-69 383 left manifold.