Keep your load secure and even on the bumpiest rides. The fastening strap kits keeps everything in place. Reference: 000017770 For light load transportation. Includes 2 wide and 2 narrow straps with tensioning mechanism to fix objects onto roof bars or inside the boot.   Reference: 000017771 For securing heavy loads. Includes a hook and a tensioning mechanism to carry loads securely and effortlessly. Personalised SEAT Sport.