Polaris 2878272 Bed Box Extender Kit Rugged, durable plastic matches the plastic of the stock cargo box for protection and an integrated look Adds over 5 (12.7 cm) to the vertical walls of the cargo box Increases the cargo capacity and the variety of cargo that can be carried securely Offers additional tie-down points for securing cargo, and has grommets to accept bungee cord hooks Installs easily