Some time ago, I tried to harmonize luggage across a few different machines. In particular, I wanted to use the same tank bag so that I would not be in danger of forgetting to transfer the mini flashlight or the USB adapter or the crampbuster, to the machine I was riding. I used the SW-Motech tanklock system and that took care of 2 machines. However, on the RT, there was no EVO tank ring offered. Why? They clearly had a ring for the hole pattern as it was the same as other years. After thinking about this on and off for a year, I saw a tank ring on sale and ordered it from Revzilla.
Once installed, I could see the issue. Unlike the prior generation tanklock, the EVO has a much larger rectangular base on the bag. This interferes with the stock tankbag rack. In addition, the shape of the EVO tank ring interferes with the gas cap when opening. Being motivated to resolve this, there were two parts to the solution. First, the supplied standoffs were too short. A trip to the hardware store yielded 0.5 inch standoffs that elevated the ring so that the bag would seat properly. Second, the dremel tool came out, and shaved the inside of the EVO ring so that the gas flap would open and close. All told, $4 and 15 minutes of work solved the problem.