IMS is the only site so far that has a 4.8 gal tank that I need. Cost $275 a little more than I wanted to spend but a good trade off for extra fuel. The fit and function was my concern so I wonder if they sell after market fuel tank covers that work with the IMS tank? I may still purchase one just to see how well it works then order another cover and trim it out here and there. Still $$$$$.