Below is a list of light bulb types used in 2017- MERCEDES-BENZ X-CLASS lighting system, covering pickup and flat-bed/chassis vehicles.
Headlight bulb: low beam - H7 / high beam - H7
Parking light bulb: W21/5W
Fog light bulb: H11
Front indicator/turn signal bulb: WY21W
Daytime running light bulb: W21/5W
Rear indicator/turn signal bulb: WY21W or PY21W
Tail light bulb: P21/5W
Brake light bulb: P21/5W
Back-up light bulb: W21W or P21W
Rear fog light bulb: H21W or P21W
License plate light bulb: W5W