There were three bed styles:

1955 - stepside (1/2 - 3/4 - 1 ton beds.

1955/1956/1957 Chevrolet Cameo and GMC Suburban Carrier (1/2 Ton only) This one used fiberglass panels instead of fenders on the same stepside box.

1958 - Chevrolet Fleetside and GMC wideside Short bed and Longbed versions