I used a 3gal spun aluminum tank off ebay and took a 6-pack rack and cut the bottom rails off the rack and welded on new mounting brackets for the tank onto the 6-pack rack. I use a shutoff valve under the tank, then a filter then it feeds into the back of the front tank. I run my dune bike on methanol and get more mileage out of my two tanks than the stock banshees do on gas with just the front tank. I aldo did the same thing for the tank on my R6 raptor. The factor air box and carbs sit under the front plastics so I moved the tank to the rear just like my dune banshee.