Below is a list of light bulb types used in 2018- MERCEDES-BENZ SPRINTER lighting system, covering van, flat-bed/chassis and minibus vehicles.
Headlight bulb: low beam - H7 / high beam - H15
Parking light bulb: W5W
Front indicator/turn signal bulb: PY21W
Daytime running light bulb: H15
Rear indicator/turn signal bulb: PY21W
Tail light bulb: P21W or R5W
Brake light bulb: P21W
Back-up light bulb: P21W
Rear fog light bulb: P21W
License plate light bulb: W5W or R5W
Light bulb sizes for other MERCEDES-BENZ SPRINTER generations: SPRINTER (903) / SPRINTER (906)