ARKON Replacement Upgrade or Additional Headrest Car Seat Mounting Pedestal for Arkon Dual T Tablet and Smartphone Holders (HM003-SBH) Works with Arkon Dual T smartphone and tablet holders; not a complete solution Compatible with nearly all 2 post style headrests The pedestal's adjustable arm extends 15 inches to 24 inches horizontally Limited lifetime warranty supported by Arkon