I have a nearly new under seat storage compartment for 07-13 Sierra or silverado 1/2 ton and 07-14 2500 or 3500 series GM trucks. This mounts easily and fills the entire area under the back seat. Great storage, keeps everything under the seat. Well over $200 at dealer, first $100 takes it. Traded truck and won't fit my new one. Excellent shape. Can assist with install. You can call me at 308-520-seven one nine one if interested.