Originally Posted by Black Pearl
3057 are a single philament bulb and the 3157 are dual philament. The LED'* will work just fine in your parking/brake lights. If they don't light up when you put them in, turn them 180* and they should work, some are picky that way
I hate to disagree, but you're wrong here. While researching this (during the time of the original post), I looked at 3057 and 3157 bulbs. Both are dual filament type. They HAVE to be. Why? Because your factory OEM stop light bulbs are 3057. A single filament bulb couldn't come on with the headlights, then get brighter when you apply the brakes. Thats the second filament doing it'* job.