They work as signal lights but are not backup lights. The reverse lights are T-15 bulbs, not #3157, as I understand it. Does anyone in the know post these listings? These are good lights for position lights and signal lights, but the pins are too wide to accommodate a narrower backup socket. I don't know the durability yet. Some bulbs are real junk while others work as they should, using about 1/10th the wattage of a standard filament type. The reason I didn't give them a lower overall rating is because they worked in other parts of the car. At first I was upset that I was misled in the purchase. This isn't the first time I've been given incorrect information about a car part that was supposed to fit.
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