This KARGA requires you remove the 40% side of the back seat that is right behind the driver's seat, then you attach the KARGA base to the existing seat mounts and end up with a new backseat storage system. The KARGA - Double Level 'Seat Delete' has the most storage of all the KARGAs. When you remove the seat, which takes only four bolts, you create immediate access to the built in Toyota truck storage and you ALSO get the space the seat occupied. In our opinion, this is the best way to use this space. KARGA - Double Level 'Seat Delete' comes with: Two non-slip neoprene mats Three lower walls to create a box (the door creates the fourth side), Installation Hardware KARGA - Double Level 'Seat Delete' specifics: The distance between the first level and bottom of the second is 13" Custom lengths available upon request - just email support@63ind.com. 150 Pound combined load. Note: Please don't put your bowling balls on the top level! Safety first! KARGA - Double Level 'Seat Delete' contains: PC-ABS 16 gauge galvanized steel Custom aluminum extrusions ACM (Aluminum Composite Material) TPU feet Made in the USA Patent Pending We also have a KARGA, Single Level, Seat Delete!