On the suggestion of another FABO member I went to McVeigh Springs to get rear springs for my 73 Dart Custom. I got the five leaf spring with the standard arch. The front end on this car is set to the lowest recommended setting.
McVeigh was easy to work with, prompt, and price competitive. FWIW, the wheels are chrome road wheels (aka Magnum 500s) with 205/60-15 tires.