It's likely the answer to your question is found in the 1969 sales literature at
Hamtramck Historical and/or the 1969 Mopar parts catalog
hereStarting on page 23-100 of the catalog, there are dozens of illustrations of car exteriors showing every piece that the assembly line was supposed to put on the exterior of a certain model. You will have to search for the model that Swinger 340 belongs to. Unfortunately I have never found an index, so you will have to wade through all the iterations of Polaras, Coronets, Satellites, station wagons, etc..
If you know the part number of the Dart nameplate, you can enter the Numerical Index to see which page in the catalog mentions that part number.