General RZR Discussion What is AA or AD mean when ordering decals September 9, 2015 My son’s 2011 xp 900 needs rear fender upper and lower decals but on every site I go to it says AA or AD on the part number of the decals. I don’t know how to tell which one ours is. (AA) or (AD) anyone know? Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related