Acerbis auxiliary tanks mount on the front forks in place of the front number plate/headlight. They carry extra fuel to increase fuel and fun range! Included mounting kit secures them to most front forks.
As with any aftermarket parts, installation may take some ingenuity. I mounted this on my Yamaha YZ250FX for a 2-day 300 mile ride to Moab and back. Everything worked great, no issues with leaks or fuel siphoning / transfer. I had more than enough fuel for our 80+ mile fuel stops and didn't have to carry fuel bottles in my pack! Now that mounting is dialed, it is quick and easy to install for longer rides and remove the rest of the time. Much more cost effective than a larger capacity tank.