Mazda 07-14 Mazda CX-9 & 03-11 RX-8 Front Door Speaker Adapter Spacer Rings - SAK021_55-1 Pair 3/4" deep adapters assure no clearance problems Utilizes existing vehicle mounting points, and requires no cutting or drilling Manufactured with 5 1/2" round cutouts to house most 6 1/2" aftermarket speakers