1990-1996 Nissan 300ZX (bose Model) 6 1/2" 6.5" Rear Speaker Adapters - SAK044_55 - One Pair 1/4" thick 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