ERA round tail light layout/configuration

[VanCobra]

What is the ERA configuration for their dual round tail lights? Single upper light with lower reflector; or dual bulbs on each side (ie. upper brake, lower turn signal) with two cutouts for bulbs? If two cutouts, would anyone be able to provide size of cutout and spacing?

As I understand it, the original CSX cars that came with dual round tail lights were single bulb upper for both brakes and turn signals and the lower round light was just a reflector.

The reason I am trying to find out is because I want to confirm whether or not an ERA 427 car with dual round tail lights can be changed to rectangular tail lights without major 'glass work. In my search for an ERA 427 car, it seems like most of the ones for sale have the street light configuration and I don't necessarily want to pass on one that is close to what I want (ie. rectangular tail lights), if that is something I can change relatively easily.

In searching this forum previously, I did come across a a thread that said ERA uses a different mold for the rear section on the body of their comp and street configs and that the shape is slightly different; however, if memory serves, it didn't really say whether or not it could be done if a person is willing to accept the shape difference.

Any information on the above is appreciated.