A system includes a glare-blocking member including a left recess, a right recess, and a rail including, a left lateral portion including a left protrusion configured to mate with the left recess of the glare-blocking member, a right lateral portion including a right protrusion configured to mate with the right recess of the glare-blocking member, and a projecting contour disposed between the left and right lateral portions, wherein an apex of the projecting contour is disposed farther from a line passing through lower edge portions of the rail than is either the left or the right protrusion.