Vehicle roof support assembly

A vehicle roof structure assembly includes a mounting bracket having a first aperture disposed therethrough. The vehicle roof structure assembly further includes a roof bow having a longitudinal body portion defining an inner channel. The longitudinal body portion includes a bottom wall having a second aperture axially aligned with the first aperture. The vehicle roof structure assembly further includes an insert block disposed within the inner channel of the roof bow. The insert block defines a third aperture disposed through a thickness of the insert block. The third aperture is axially aligned with the first aperture and the second aperture. The vehicle roof structure assembly further includes a fastener disposed through the first aperture, the second aperture, and the third aperture to rigidly secure the roof bow to the mounting bracket, and to rigidly secure the insert block to the roof bow.