Here are some comparisons shots of a stock Cox, an ISO and the silver Carrera. If anyone is interested, I did some searching last nite and the 1/24 Carrera red version is available at Modelcar Roundup for $99. If anybody wanted one, this is as good a deal as you will find unless they re-release them some day.
Kind of looks like the Carrera is in between the Cox and Strombecker bodies. I don't have a 1/24 Strom, but they are shorter and wider than Cox. Carrera does set nice, but it's on a custom chassis with smaller wheels, so a stock car may be taller than this one.
You may notice the color of my mag frame car. I've had a few of these over the years and this one is pretty much as I got it. You can see looking at the windows that it has been sprayed with candy red. I think it gives the body a better color than the stock Cox plastic.