This Rack Kit is for truck camper shells and trailers that have roof top sizes no larger than approximately 1255mm/49.4'' (W) x 2166mm/85.3'' (L). The Slimline II Tray and eight (8) supplied Feet mount onto the OEM/Factory installed track of your canopy/shell or trailer.This taller kit has space for mounting the Front Runner tables or other compatible accessories under the rack.NOTE: Additional fasteners may be required to fit OEM/Factory supplied tracks.