I have a new Maier one quart jug that attaches to the handlebar cross bar, I ended up not installing it after I found out about desert tanks.
I have seen tanks that are a number plate too, but cannot remember who makes it. When I ride my KX500 I always have more fuel left than anyone else. I ride with green blue and yellow. And everyone points to my tank ( clear) and mentions the amount of fuel that I have. I think the IMS tank is 3.2 or 3.6 gallons.
Johnniespeed