Charley,
The shells Roadster62 shows are correct. Missing is the emblem on the top which I believe is available as a reproduction. The 1931 emblem is stainless steel like the passenger car of that year. The 1930 emblem is blue porcelain like the passenger car of that year. The basic shell was the same for the two years and was the same shape as the stainless 1930 passenger car shell. There was also a big truck shell for the two years that lacked the peak in the center. The '28-29 shells were shorter like like the passenger cars for those years but I don't have details. Do you already have the steel headlight and tail light buckets? Now that you know what you are looking for it would be a good time to place a "wanted" ad. If you posted your general location (it would be good to include it in your profile) someone in the same city might have what you are looking to find.
Charlie Stephens