For the 1999 Hyundai Elantra, both the low-beam and high-beam headlights use a 9003 bulb. The supplied fitment data does not indicate a separate bulb option or a projector/non-projector headlight distinction, so verify the existing bulb and housing before ordering.
Front fog-light fitment is listed as either H3 or H3C, making the fog-light housing an important point to check. Front turn signals, parking lights, and front side markers use 2357A bulbs. At the rear, the brake and tail lights use 2357R, while the rear turn signals use 2357. The reverse lights and center stop light both use 1156.
For smaller lighting locations, the license-plate bulb may be 168 or 917. The rear side marker uses 168NA. Interior applications include DE3022 for the courtesy and trunk lights, 6418 for the dome light, and DE3175 for the map light.