Round vs square tail lights

Buddy, It seems that all of the Comp and Semi-comp cars had square lights. Many of the Roadsters had round, apparently the change from square being around chassis number CSX3201. The top one was the tail/brake light, and the bottom was a reflector.

One of the things that makes it tough to track details like this, is that when the Semi-comp cars started going up in value, many Roadsters were converted...adding side pipes, hood scoops, quick jacks, etc. So we see what looks like an S/C with a glovebox or bumpers. Because of that and individual mods over time, many original cars are not the way they came from the factory.

Bill