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The LightRail® 5 Fore & Aft Crossbar Mounting kit allows the user to mount their crossbar and hang their lights in line with the rail. The Add-A-Bar kit includes LightRail® 5 trolley, crossbar, 4 foot push rod and all the hardware needed. Does not include 4 ft rail. Extend your LightRail® 5 by 4 feet with this auxiliary rail.