1940 Ford tail light?

Three years ago I bought a 1940 Ford Coupe in fairly decent restorable condition and I am nearly finished with the restoration, which I am doing as close to original as possible. Anyway, I took it out for a short drive for the first time yesterday and a sheriff's deputy pulled me over and gave me a ticket for having only one tail light. I told him the car was manufactured with only one tail light, which is on the driver side, but johnny law insisted that law requires tail lights and brake lights on both sides of the rear. I considered installing a matching tail light on the passenger side rear when I did the rewiring but chose not to because, like I said, I want the restoration to be as close to original as possible. I think the traffic court judge might throw this ticket out if I can convince him that the car was manufactured with only one tail light and convince him that I use arm signals when I turn but it would be much better if I could cite a law, if there is one, exempting this car from having two tail lights since it was manufactured with only one. Is anyone aware of such an exemption I can cite? I live in Illinois. But please, an answer like if it was manufactured with only one tail light then that is all that is required is not good enough. What I am asking for is a legal statute I can cite which allows it to have only one tail light. I have seen a lot of vintage automobiles at car shows which have only one tail light and no turn signals and I have never heard anyone complain of getting a traffic ticket because of it and so I suspect there is a legal statute exempting them but unfortunately Google searches has not helped me find it.