SYLVANIA - 9003 XtraVision - High Performance Halogen Headlight Low Beam and Fog Replacement Bulb (Contains 2 Bulbs)Lights Dim Over Time, Replace In Pairs: Your lights are a pair, one is never turned on without the other. If one bulb burns out, the other isn't far behind. Replace your 9003 XtraVision Halogen bulbs in pairs for optimum performance. More Downroad Visibility: XtraVision bulbs have an enhanced downroad visibility with no added glare. Reliable Design For Optimal Performance: XtraVision bulbs have a robust filament design and propriety gas mixture that