Vintique makes one that looks like a original tank ... shape, size and dimesions. I believe Brookville sells them as well as CW Moss and others.

I always use a original style tank ( I always use original tanks ... ) but sometimes that is not possible for everyone. The oversize tanks look wrong IMHO ... and the extra few gallons of fuel is not needed ... unless you have a real gas hog. A stock tank holds enough fuel to run 150 to 200 miles ... unless you really have a gas hog. After driving 150 to 200 miles in anything ... I need to stop, get a fresh Diet Coke and let the " OLD Diet Coke out " ... I just get fuel when I make my " Pit Stop "