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You need a rectangular piece of circuit board (holey board) that will fit in the rear of the middle stoplight and at least four high brightness LED's and a 680 ohm 1/2 watt resistor for each LED. You can hold the circuit board in place with some small pieces of velcro. I have supplied this stuff to several CFers cheap and they didn't know much about electronics and they successfully installed the LED's. LED's will outlast your lifetime. You can get everything you need except the high brightness LED's from Radio Shack. I can sell you some high brightness red LED's for what I paid for them, $1.25 each. You can see that I will become extremely rich!