So, it is a bit difficult to see the exact shape of the brackets, but they look to be somewhat of a couple of simple C brackets.
Did you have to install a resistor or anything for the LEDs?
Man, that is such a seemingly simple mod that looks great! I may have to do this one!! Thanks!
Essentially it is a braket bent into a "C" shape with the addition of the side plates to hold the turn signales. I mocked the brackets up with cardboard and then pattern onto aluminum plate. It took a bit of fiddling but it wasn't too bad. No resistors were needed. The turnsignals have resistors in the board to obtain correct blink rates, while the tailight is just wired to the factory wires with a simple 3 wire pigtail.