Below is a list of light bulb types used in 1996-2004 MERCEDES-BENZ SLK-CLASS lighting system, covering convertible vehicles.
Headlight bulb: low beam - H7 / high beam - H7
Parking light bulb: W5W
Fog light bulb: H1
Front indicator/turn signal bulb: PY21W
Side direction indicator bulb: WY5W
Rear indicator/turn signal bulb: PY21W
Tail light bulb: R5W
Brake light bulb: P21W
Back-up light bulb: P21W
Rear fog light bulb: P21W
License plate light bulb: C5W
Interior light bulb: C5W
Boot light bulb: C5W
Reading light bulb: R5W
Light bulb sizes for other MERCEDES-BENZ SLK-CLASS generations: SLK-CLASS (R171) / SLK-CLASS (R172)