For the rears, you'll need a 3 ohm load resistor for each side, such as this:
http://www.v-leds.com/BlinkerWarning...-p5679822.html
For the fronts, you'll need a 6 ohm load resistor for each side, such as this:
http://www.v-leds.com/BlinkerWarning...-p4783296.html
You'll have to mount them to metal, or out in the open so they don't touch anything that can melt, because they get pretty hot.
The fronts won't get tremendously hot, but the rears may since they'll be powered whenever the turn signals, or the brake lights are on.
But its worth it, they are precise, with a nice crisp on and off, as opposed to the slow fade on, fade off of a normal incandescent bulb.
Plus now all 5 of my brake lights turn on at almost the exact same time, as opposed to before how the 3rd brake light would turn on, then the other 4 would fade on.
This is where I mounted mine front and rear: