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This listing features 10pcs of 31mm White festoon LED Light Bulbs for replacing the burnt out dome/map lights. Specification: Color: White Bulbs Size: 31mm LED Type: 12-3528-SMD Working Volts: 12V DC Each bulb contains Heat Sink to prevent Overheat Package Includes: 10pcs 31mm white festoon bulbs Cross Reference: Festoon 31mm-35mm: 3021, 3022, 3175, 6428, 6430, 6461, DE3021, DE3022, DE3175 Festoon 36mm-39mm: 3423, 3425, 6411, 6418, 6423, 6461, DE3425 Festoon 40mm-44mm: 211, 211-2, 212, 212-2, 214-2, 569, 578, 6413, 6429, 12844, DE4410 Installation: Easy installation, just plug & play. All you need is to remove the lamp covers with a small flat screwdriver and direct replace the stock lamps with LED lamps. LED lamp has "+" and "-" terminals, if the LED does not light up, just simply flip it 180 degrees to reverse the polarity. Note: We recommend that you measure the length of your original bulbs to make sure our bulbs will fit your car.