Just your basic 4 Pin Relays, I got mine at the local auto parts store for around $6/piece. Power, Ground, Switch and Output. The Power and Ground I wired right into my power and ground connections from my HID kit to make things easier and only have one connection to the battery and protect the signal relays with the existing fuse as well. Power connects to # 30 and ground to #85. Next you will have to cut the turn signal flashing wire to split it, but be sure to make the cut 2-3 inches behind the bulb connector so you have some wire to play with on both sides. The vehicle side of the turn signal wire needs to be connected to #86, and the bulb side gets connected to #87. This will complete the relay wiring. Repeat on the other bulb.
Now, for the resistors, you must wire them on the vehicle side (before the power runs through the relay) to prevent hyperflashing. Connect one wire from the resistor to the turn signal wire on the vehicle side, and the other spliced into the ground wire, which will be the black/green wire. The reason a resistor is needed is because incandescent bulbs have resistance to them as the power runs through it, LED bulbs do not. The vehicle flashers depend on this resistance to slow down their function, and when the resistance is no longer there, they flash faster. The resistor will basically trick the flasher module into thinking there is still an incandescent bulb there and slow it down. I will try to write this out soon on a diagram, but this could get you started.