A vehicle body structure includes a roof panel, a front structural support member and an optional extension member. The front structural support member includes a first A-pillar attachment end, a second A-pillar attachment end, a front edge extending between the first and second A-pillar attachment ends and a rear edge extending between the first and second A-pillar attachment ends. In a first configuration, the roof panel attaches to the front edge and also to another region of the front structural support member. In a second vehicle configuration, the extension member is attached a rear edge of the front structural support member and extends to a position on the roof panel that is located vertically above the front structural support member when the front structural support member is in an installed orientation.