They definitely are domes....did you know there are different part numbers for the domes. Something different about the diameter. Maybe 5 on 5 for Imps. I don't thnk 14" road wheels were ever made. But I know for sure there are different part numbers and they are definitely different diameter configurations.
The different diameters for the domes are for either the 16 slot road wheel or the urethane road wheel most often seen on Cordobas. Regardless, the urethane domes fit on the 16 slot road wheel but not the other way around.
As for the 16 slot road wheel we know of the 70-74 domes that polara 71 showed. and then there is the 75-81 dome with the snap on cap. The Urethane wheel domes used the same snap on cap as they came out in 75 on the Cordoba.
Chrysler Corp never made any 5x5 domes for Imperials because steelies with wheel covers is all they offered for Imperials.
Here's pics of the two different diameter 75 and up domes. The one with the ring closing the stud cavities are for the 16 slot wheel, the ones without are for the urethane wheel.