I couldn't find any larger tanks for the WR450 that imcreased the capacity by a gallon or more. I fabricated this holder - it bolts to the headlight mounts (2 top and 2 bottom) and holds a std 1 gallon gas can. Plan on using it only for those long day trips. It can be changed out with the headlamp in about 10 minutes. Will be subjecting it to "durability testing" next weekend.