With the R/G rear auxiliary tanks for the KTM 790/890 you can add extra (combined) 5 liters (1.3 gal) of fuel and increase your riding range. The tanks are equal size and connected to the fuel line of the main tank if you are using the original KTM configuration or to each side tank if you are using the R/G front rally tanks. They are drained by gravity.
The tanks are exactly the same size and shape as the original plastic panels. That makes them compatible with any exhaust silencer, luggage racks and other accessories using the same attachment points as the PowerParts racks.