I did this a while back but with an old fashioned light. Used a round dinner tray I found at Salvation Army that fit the inside of the hub perfectly. Drilled 2 holes in it, 1 for the wires, 1 for the butterfly bolt on the back side to hold it into place.
Do not have a pix, took it off to work on the tire carrier and the Mrs threw it out ( my fault, left it in the garage but not in the Rover Zone.
I'm contemplating thinking about thinking about it!