Rear structure of vehicle body and mold system for producing of the same

A rear structure of a vehicle body comprising:

• a modular vehicle body rear complement including a rear cross member, a back panel, and a rear vertical panel arranged on both sides of the vehicle body to connect the rear cross member and the back panel, and having a tailgate opening formed on an inner side thereof;
• and
• an interchangeable rear end surface system of the modular vehicle body rear complement configured to provide either a first version of a rear end surface of the modular vehicle body rear complement or a second version of the rear end surface of the modular vehicle body rear complement, depending on whether a first mold or a second mold is selected at an end stage production process for the rear end surface of the modular vehicle body rear complement,
• wherein the first version of the rear end surface extends in a length direction of the vehicle body and is configured to interface with a tailgate, wherein the first mold includes a length direction machined cylinder, and
• wherein the second version of the rear end surface extends in a height direction of the vehicle body and is configured to interface with a tailgate-less cover, wherein the second mold includes a height direction machined cylinder.