For the 2006 Honda Element, both the low-beam and high-beam headlights use a 9003 bulb. The supplied fitment data does not identify a separate bulb for the two headlight functions, and it does not list a fog-light bulb.
Several exterior lighting positions use related 7443-family bulbs, but they are not interchangeable by suffix: the front turn signals and parking lights use 7443, while the brake and tail lights use 7443R. The rear turn signals use amber 7440A, and the rear side markers use 7443A. The front side markers take 168NA.
For other useful replacements, the reverse lights use 921, the center stop light uses 7440, and the license-plate lighting is listed with either 168 or 917. Interior dome, map, and trunk lights use DE3175. Check the existing bulb and socket before ordering where multiple fitments are listed.