A contemporary 30's Ad from a magazine is currently on eBay, and shows 20 different models of 1931 Chevrolet, as well as the various approximate colors. Models are described as:
2-3W Coupes, Standard and delux
2-5W Coupes, Standard and Delux
2-Sport Coupes (rumbleseat)including delux
2-5 Passenger Coupes, including delux
2-Roadsters, standard and sport
3-Cabriolets, standard, convertible and delux convertible
3-Phaetons, including Phaeton, convertible landau phaeton, and delux convertible landau phaeton
2-Coachs, standard and delux
2-Sedans, standard and delux
Delux generally shows sidemounts, grill and likely cowl lights, etc
Has any one seen this, and is this accurate as far as both model count and colours available?

Sorry, but have to edit my own list;
Should indicate 3 roadsters (instead of 2) being the standard, the sport and the delux sport.
Also, only 2 Cabriolets (and not 3), being the Convertible Cabriolet, and the Delux Convertible Cabriolet.
Even looking at the ad it is difficult to list them all correctly. By the way, I bought the 14"x21" ad from Saturday Evening Post,and look forward to getting it. It was from a 1931 edition and is advertised as an original ad from the mag.

BTW, was a delux roadster available? i.e. with the delux features, but with a trunk versus rumble seat? That would make 21 models eh?

Thanks Bill. I don't think I had seen your referred to chart before. It is interesting that the Manufacturer's Ad for 1931 showed 14 of the 20 models with stoneguards, including all sport and deluxe models. Much like today, I suppose manufacturers sometimes showed pictures with options included without saying so!