It appears that you have 2 kits, and that the contents of the kit changed slightly over the years (which did happen as it was realized that certain bits were not needed) since the 20/25 is powered by an inline 6 cylinder engine.
You should contact IntroCar's parts department to confirm whether this is one kit, or two, as I suspect. Pre-War is "not my era."
The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth. ~ Niels Bohr