An assembly for a sunroof of a vehicle includes a longitudinal rail defining a longitudinal cavity having an opening. A bracket supports a first sunroof panel for movement along the rail, between a closed position and a fully open position. A portion of the bracket extends into the cavity opening and is movable along the cavity from a first side of a plane extending through a forward-most edge of the second sunroof panel to a second side of the plane opposite the first side of the plane, during movement of the first sunroof panel to the fully open position. Enabling the support bracket to move to the second side of the plane aids in maximizing the size of the sunroof opening when the panel is in the fully open position.