This Adaptor allows the use of 6x9'' speakers instead of the smaller 5x7'' speakers in a Harley Davidson saddlebag Lid (CVO style) 2014 and newer. Please note that the plastic speaker cage inside of the Lid has to be removed. Can be printed without supports. ABS recommended, but PLA also worked fine for me. Just mirror it in your slicer to get left / right version. Use the Distance Ring for correct hight if needed.