I used them as front and rear turn signals on my 1999 Ford F350. When I opened the box and they arrived my first thought was "Oh these things are HUGE". But there was enough space in the lenses in the truck and they fit perfectly, don't worry. Since I needed 4 and it was an 8 pack I figured I might as well use a couple of these for backup lights. Even if they're just single filaments (remember 1157 instead of 3157?), they fit and glow great and are way brighter than the old incandescent bulbs. This should make reversing with a trailer much more pleasant. The reverse light lens assembly was a bit firmer - the LED assembly almost touches the plastic inside but fits. Hardly. Note that they are polarity sensitive - whatever you are replacing, activate these lamps (turn on 4 directions or have someone reverse check the car) and give it a try. If it doesn't light up, flip it over and it should work. Also note that you may need to upgrade the flashing module to be compatible with LEDs. I did so and after ordering a piece of an unwanted module from Revain, I received a Novita brand EP27 module instead which worked great. I worked with the bad one at first, but then it kept clicking even with the engine off and the key removed. Not good. The Novita brand has worked as expected, so do yourself a favor and just get started. Your local auto parts store may even have them in stock.
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