You sure you got the VIN correct? For a 56 model car it should be either 6 or 7 digits long, not 8. That aside, the ragtop should be 2-fold as the number of bows in the design changed in August 1955 from 5 to 3, hence the change in folds. Beware, '56 was a funny year and there are several little changes that went on with the ragtop design such as corners changing between rounded and square, little changes to mechanical bits etc.