Bob, look at page 24, it has pictures, the lower left is the top view of the roadster cowl, with the recess for the door, this was used on the first procurement of the two in 1931. This is the cowl used on the York Hoover bodied trucks, which is what mine is and has the roadster cowl as pictured above. The lower right picture is of the commercial cowl used on the second procurement of 1931, which were mifflinburg bodied. these had no recess. looking at these two pictures in Aldie book, you can clearly see the difference. I tried for 45 minutes to upload pictures, but had no luck. It is a roadster cowl. As stated earlier quit looking at the top of the cowl.