Abstract: A roof structure for an automobile wherein an opening is provided in the sheet metal roof and a reinforcing-mounting member formed of plastic is provided about said opening adjacent said roof and firmly secured to the support means for the roof. Such reinforcing-mounting member is formed with a U-shaped continuous channel adjacent the marginal edge of the opening in the roof to receive the offset marginal edge of a lid which is secured over the opening by suitable clamping means. Sealing means is provided within the continuous channel adjacent the offset marginal edge of the lid, and a wind deflector is provided for insertion in such channel to be firmly retained there when the lid is removed.