Full Crew Cab Models Only! Includes 1 Under Seat Storage Box (with installation kit and durable premium custom fit foam organizer inserts); Compatible with 2007-2018 GMC Sierra 1500/2500HD/3500HD Crew Cab; IMPORTANT NOTE FOR 2014+ Model years: please make sure you have a Crew Cab model - for 2014+ Crew Cabs, the rear door should measure 40" wide (review photos to verify you do not have the smaller rear doors that this item will NOT fit). NOT CONFIRMED TO FIT 2019 NEW BODY STYLE - Approximately 54-1/2" wide x 16-1/4" deep (custom designed to only fit full Crew Cab models); Perfect solution for keeping your valuables stored away and out of sight; Great for tools, sports gear, winter accessories, hunting and fishing equipment and more. Deluxe kit includes strong high density anti-rattle foam custom fit organizer inserts for keeping your gear optimally organized and separated. Maximize your storage space, with a variety of shaped pockets to give you easy, clutter free access to everything. Storage box attachment system is engineered to be superior; It is very strong yet easy to put on and off so you can remove your box if you need to. No fumbling and fighting like with other systems. Storage box is made from tough high impact molded heavy duty automotive grade black plastic; not at all flimsy; resistant to most chemicals; Does not interfere with feet or foot well area; Custom fit organizer inserts are made from rugged, high density, stylish form fitting waterproof black foam material that is anti-rattle, anti-slip and easy to clean. Factory look and quality with large storage capacity and premium foam organizer insert set.