TGP 3157 White 64 LED SMD Wedge Reverse / Backup Light Bulbs Pair 1999-2006 Ford F-250 F-350 F-450 F-550 Content: 3156/3157 64 LED SMD White - Pair Compatiblility: With any Vehicle application for interior and exterior bulb replacement which requires a 3156/3157 Color: White Dimension: 41x15mm Note: LEDs can be polarity sensitive. If you install these LEDs and they are not working, please flip them around and re-install them and you will be fine.