CNC-machined HDPE block off plates designed to seal the factory speaker access holes in your 2023+ Sierra HD or Silverado HD (2500/3500) doors. Whether you are running factory speakers or aftermarket upgrades, the original access holes in the inner door skin allow bass energy to escape and let road noise enter the cabin. Sealing them creates a semi-sealed chamber behind the speaker for tighter bass response and a quieter ride.

Each plate features pre-marked alignment circles for easy positioning. Drill 1/8-inch mounting holes and secure with the included zinc coated screws. Foam sealing strips included to seal the plate to the door panel.

Front plates fit Regular Cab, Double Cab, and Crew Cab.
Rear plates fit Crew Cab only.

Does not fit 1500 models - see our separate listings for Sierra/Silverado 1500.

CNC-machined from solid-core virgin HDPE in Mount Juliet, Tennessee. GMC, Sierra, Chevrolet, and Silverado are registered trademarks of General Motors. Used for compatibility reference only.