See The Track Installation Instructions In The INSTALL Tab For Further Details,This Rack Kit Is For Truck Canopies/Camper Shells/Caps And Trailers,The Slimline II Tray Mounts To Eight Supplied Feet That Slide Into The Supplied Track,For Roof Top Sizes No Larger Than Approximately 1165mm/45.9 in. W X 1762mm/53.5 in. L,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,The 1600mm/63 in. Long Pair Of Tracks Can Be Easily Mounted To Your Canopy/Shell Or Trailer