I have a storage box that is designed to go underneath the rear seat of a 2011 Silverado 2500 extra cab. This is designed to keep your storage things from sliding out under the seat. It fits very nice and worked very well. I sold the truck. $30. This costs over $100.00 new. Phone calls only please As I never check email. Don’t waste my time with your scams. This is located on Orchard Mesa.