See The Track Installation Instructions In The INSTALL Tab For Further Details,This Rack Kit Is For Truck Canopies/Camper Shells/Caps And Trailers,Contain Installation Instructions As Well As All The Components Needed To Mount The Slimline II Tray To Your Vehicle,All Front Runner Racks Are Backed By A Limited Lifetime Warranty,For Roof Top Sizes No Larger Than Approximately 1475mm/58.1 in. W X 1560mm/61.4 in. L,The Slimline II Tray Mounts To Six Supplied Feet That Slide Into The Supplied Track,The 1600mm/93 in. Long Pair Of Tracks Can Be Easily Mounted To Your Canopy/Shell Or Trailer