77 & 73 models were the 85 hp and 60 hp engines respectively, mounted on the 112" wheelbase chassis. The basic pickup was available, and I believe a platform and stake were also available with the 112" chassis.
The half-ton pickups in 1937 included both Standard and Deluxe models, "regular" pickups with a bed, half-ton stakebeds, and both 60hp and 85hp engines were available.