Well Baytown, not much of us Chaps in the U.S. will be useful as to where. Obvious reasons.

There are plenty of threads that do address this topic.

The low down is the black Honda Radio knob will not fit in the rear indentation. It's too big in diameter.

Here in the U.S. we get the blanks from any key place and use the 27R blank. I believe Hillman is the manufacturer.

Remember, you will cut the top some in order to fit it into a knob. Any knob will due just go find one you like at a Radio Shack if you have those down there.

In addition, there is a manufacturer that has remote control to open the panniers!