The map button and two LEDs are just held in place with silicone, they just pop out of the original mount.   I made a bracket out of an right angled piece of plastic (made from the edge of an old plastic box), drilled out holes along the top for the button and LEDs. I think the button is around 11 or 12mm and the LED's 4mm.   I hot glued them in to the new bracket from underneath and used a couple of small, counter sunk bolts and nuts to bolt it to the back of a normal number board, close t