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I have a super easy clean install when upgrading my oem to these Black Diamond 6.5". I just carefully remove the stock speaker oem gasket and apply between the adaptor and door panel and added a other gasket between the adaptor and 6.5. I got now a little more in depth sound for the rear doors. As people said it sounded like dull.
These adapters made it simple to install aftermarket rear door speakers in my 2016 Sierra Crew Cab. The speakers are secure with no rattles. I sealed the adapters to the door with a thin bead of RTV and secured with the original retaining screw.