An adjustable connector for connecting a display panel to a rail is described. The adjustable connector includes a rail-coupling bracket and a display-coupling bracket. An upper adjustment carriage is positioned between the rail-coupling bracket and the display-coupling bracket at an upper end portion, and a lower adjustment carriage is positioned between the rail-coupling bracket and the display-coupling bracket at a lower end portion. An upper pin extends through a horizontal slot in the display-connecting bracket, an inclined slot in the upper adjustment carriage, and an opening in the display-connecting bracket. Rotating an upper hand-turnable knob adjusts a depth of the upper end portion of the display-coupling bracket relative to the rail-coupling bracket. A similar lower adjustment carriage and lower hand-turnable knob provides similar adjustment at the lower end portion. In some instances, the adjustable connector provides up to 15 mm of depth control to compensate for uneven wall surfaces.