I will take a wild guess and say that in true 50’s Custom (“Kustom”) fashion - what you see is a pair of Cruiser skirts. They start out in front of the wheelwell and extend back to the bumper. They really are quite different from regular skirts we are used to seeing around! The idea was to give the car a lower appearance.
I must say I like custom cars but never really cared for cruiser skirts! To each his own - that is why I have Lake pipes and 16" Centerline wheels – go figure!
HHHHMMMM he is interested in another Plymouth and lives in MD??? Could there be a Custom/Modified two door post sedan in his future???
I also like these cruiser skirts. I met a guy in Sweden more than 10 years ago he also had these skirts. Part or it was chromed and they looked awesome.