Sold as each. This is the length you will need to install with our 8020 Sprinter tower brackets.
Please go to https://www.ebay.com/itm/131702371613 to view the tower brackets.
Tabs to connect the solar panel to the crossbars: https://www.ebay.com/itm/141878685652
Please contact Hein if you need help with your layout. 541-49O-5O98
Some scratching may occur in shipping.