Below is a list of light bulb types used in 1997-2002 MERCEDES-BENZ CLK-CLASS lighting system, covering convertible and coupé vehicles.
Headlight bulb: low beam - D2R or H7 / high beam - H7
Parking light bulb: H6W
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 or P21/4W
Brake light bulb: P21W
Back-up light bulb: P21W
Rear fog light bulb: P21/4W
License plate light bulb: C5W
Interior light bulb: C5W
Light bulb sizes for other MERCEDES-BENZ CLK-CLASS generations: CLK-CLASS (C209/A209)