NAGY'S CUSTOMS Mega 10" Harley Subwoofer Or Midbass Adapter Rings (Pair) All Years 98-Current*Please read* *SOLD IN PAIRS* These are the new Subwoofer, Midbass adapters(Patent Pending) for the New midbass and Subwoofers. They are an oversized Adapter ring to sit at the shock bump in a Harley Davidson 98 present. The OD is 11. 02 with a mounting diameter of 9. 40. No more having to remove the gaskets from the subwoofer to get them to fit either or trimming down the speaker itself!!!. These will fit any Subwoofer or midbass with a bolt pattern