1003 Bulb Fitment Guide

The 1003 bulb is used by 37 vehicles from 3 makes including Cadillac, Chevrolet, Ford. Browse the full compatibility list below.

Yes, LED replacements are available for the 1003 bulb size. LED 1003 bulbs offer brighter output, longer lifespan, and lower power consumption compared to halogen.

The 1003 bulb is commonly used in these positions: Trunk Light, Dome Light. The exact position depends on your vehicle's make and model.

Standard halogen 1003 bulbs typically cost $10–$30 for a pair. LED 1003 conversion kits range from $25–$60. Premium brands may cost more but often offer better performance and warranty.

All 1003 bulbs share the same base and fitment, but they vary in technology (halogen, LED, HID), brightness, color temperature, and brand quality. We recommend LED for the best balance of brightness and lifespan.