The base radiator which is what a no a/c calls for does look small in the car because it is only 20 inches. If it has a Ford top tank and no numbers on the side strap then it could have been messed with before OR is a WO MO SJ plant radiator that typically had the numbers on a tag that was soldered to the top tank where the side straps are soldered . The tag could have come off. the factory Dearborn radiator had the engineering number stamped on the side straps. It just depends on your expectations of date codes and engineering numbers. I suppose instead of a exact match all things being equal on look and condition the one your looking at may be the next best thing.