The Light Rail 5 Add-A-Bar kit allows for an additional (3) light maximum expansion to existing Light Rail 5 complete systems. Add-A-Bar kits may need an additional 4′ Auxiliary rail (LR5AUXRAIL)for systems that demand more than 2 total crossbar setups. Kit Contains:Adjustable Crossbar (81″, 87″, 93″)Light Rail 5 Auxiliary TrolleySectioned Push-Pull RodMounting HardwareInstructions