Here you are TJ ..
They mount on the vertical tube on the frame ..
These are T-Rex Racing version
The MC Enterprise system has a Flat vertical Plate (other FJR) which I drill for the mount and no need for the Tube Clamps.
On the nearside I have just have a flat base on the peg to allow for the other bag..
This has been updated to be the same as the Jug holder..
Old system was ok but needed more vertical height to support the bag.
My first system had flat plate which I mounted the extra water behind for quick access ...