For the 2016 GMC Terrain, the low-beam headlight uses an H11 bulb, while the high beam uses a 9005. The supplied fitment data does not identify a headlight-type variation, so verify the existing bulb and housing before ordering.
Other useful exterior bulb details include 7444NA for the front turn signal and parking light, 194NA for the front side marker, and 921 for the reverse light. The rear turn signal uses 3057, while the brake and tail-light fitment includes 3057R.
The center stop light and daytime running lights are listed as LED, rather than a replaceable bulb size. License plate, dome, and map lights may use either 2825 or 98. Interior and cargo-area applications also include 194 and 7441 bulbs, while the vanity light uses 6612F.