Picked up this 74 Swinger today. Yellow Floral top car

One reason could be same as why its difficult to buy any number of parts via a computer lookup - the information was wrong and no checked it.

Best thing to do is look at the factory literature from the time, and also take another look at the fender tags in different light and to compare with known items.
Barry @Alaskan_TA has provided a wonderful digitized library.
The 1970 Hamtramck Registry - 1974 Dodge Dealership Data Book - Dart

The 1970 Hamtramck Registry - 1974 Dodge Color & Trim Book - Dart