Looking for a Scout tan driver backrest and mount (standard reach) if anyone has one in good condition.

Hi all, I misplaced the installation instructions for my driver backrest, and can't get it to adjust the height. It seems to stop after it hits the first notch and wont go any lower. Does anyone know the proper way to raise and lower the driver backrest? Thanks for the help.

Does anyone know what the purpose of the Flap is on the rear of the Vintage Driver Backrest (Item # 2879542-06)? There are two snaps that allow you to unsnap the flap, but I have no clue what they intended it for...anyone have a clue? o_O Just curious more than anything....