That's the regulator board finished and ready to fit.
I made a pair as I have two Technics projects in progress.
The board locates using the stock screws and spring clip for the regulator. You will have to use an Aluminium spacer and longer screws on a stock deck, put the spacer between the die cast platform and this board. This is to raise the board above the level of the main cable entry aperture, the raised lip on this aperture will short out the tracks on the PCB otherwise as they overlap. This LM317 regulator also needs an insulating gasket between it and the metal surface of the deck/heat sink.