Gas tank for 1970 Dart Swinger

I ran into the same thing with a Van's tank a few years ago for my 1970 Dart - you can even see in the shape of the tank where the hole should be and it's way off. I got a 70 tank from Spectra/Gas Tanks. I asked them to check if the opening was centered in the round flat spot in the tank metal before they shipped it and it was dead on. The 70 CA emissions/1971 tank has a tank inside the tank that utilizes 4 hoses for evaporation reclaim - avoid it if you can! That's why the tank holds 2 gallons less.