Below is a list of light bulb types used in 2004-2012 FORD FOCUS lighting system, covering convertible, estate, hatchback, panel van/estate and saloon 4-door vehicles.
Headlight bulb: low beam - H7 or D1S / high beam - H1
Parking light bulb: W5W
Fog light bulb: H11 or H8
Front indicator/turn signal bulb: PY21W
Side direction indicator bulb: WY5W
Periphery light bulb: W5W
Rear indicator/turn signal bulb: PY21W
Tail light bulb: P21/5W, PR21/5W, P21/4W or W5W
Brake light bulb: P21/5W, PR21/5W, PR21W or P21W
Back-up light bulb: P21W
Rear fog light bulb: P21W, PR21W or P21/4W
License plate light bulb: C5W or W5W
Auxiliary stop light bulb: W5W
Interior light bulb: C10W
Door safety light bulb: W5W
Entry light bulb: W5W
Boot light bulb: W5W
Reading light bulb: T5W
Light bulb sizes for other FORD FOCUS generations: FOCUS (MK1) / FOCUS (MK3) / FOCUS (MK4)