I bought 25 led bulbs and 6 ohm resistors from superbrightleds.com and they worked great. You only need resistors for the signal lights, so if you do the front and back you only need 4 resistors. I got rid of my bulbs though because they are useless in the daylight. They just look like a tiny dot at a distance and most other drivers probably won't notice when you signal. They were nice at night though.
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