http://www.hidplanet.com/forums/foru...y.php?13-LED-s
first thing i would recommend is to join there and start reading alot. to answer your first question, match the color of the led to the color of the lense and 5mm leds arent going to cut it. once you start reading on the forums youll see why and what to use. as for your second question i cant help you there but they will be able to. good luck, ive got a pair of tail lights i started but didnt get to far yet.