Enlarged (21 liter, 5.5 gallons) ZX6/636 endurance tank. Ready to bolt on and go. R&G tank sliders still fit as if it was stock if you wanted to add them. Planning to attend the first endurance round of the year and can bring with me. Also have a fuel pump for the 09-18 models as well, not sure if it'd work with the 19+ since it doesn't have the provision for the fuel gauge.