NAGY'S CUSTOMS KB 98-Present Harley Subwoofer AdapterThese are a CNC molded 10" wheel side mount adapter with a 10. 7" OD, 9" ID 5*, and a " mounting surface tilt to follow the flow more of the outside of the saddle bag, to allow a deeper speaker to be mounted with enough room for proper ventilation. Max mounting depth will vary by bag manufacture. These were made to handle big excursion from subwoofers, it however does effect the max mounting depth on the subwoofer you can run, there work great for