Mount them with the solid sides facing the mounting surface. Check to be sure your mounting screws are long enough for a secure installation. Position the brackets on the centerlines you marked and use two screws to attach them. The tops of all brackets must be perfectly level. Standard Installation Bracket on Extension Bracket.
Arrow indicates screw placement.
Connect the installation brackets with the machine screw and speed nut which are included with each extension bracket. Be sure to use the same hole on all the extension brackets, so that each installation bracket projects the same distance from the mounting surface. Trim the brackets before mounting them. Brackets Unwind the cord from around the shade assembly, and let it hang. With the cordlock facing you, slip the headrail into the installation brackets with the front lips on the brackets in the front groove on the top of the rail.