Below is a list of light bulb types used in 2009- VOLKSWAGEN POLO lighting system, covering box/fastback, hatchback and saloon 4-door vehicles.
Headlight bulb: low beam - H4, H7 or D3S / high beam - H4, H7 or D3S
Parking light bulb: W5W
Fog light bulb: H8 or HB4
Front indicator/turn signal bulb: PY21W or WY21W
Daytime running light bulb: P21W or W21W
Cornering light bulb: H7
Side direction indicator bulb: W5W
Rear indicator/turn signal bulb: PY21W
Tail light bulb: W5W or W16W
Brake light bulb: P21W
Back-up light bulb: P21W
Rear fog light bulb: H21W or P21W
License plate light bulb: W5W
Interior light bulb: C10W, C5W or W5W
Footwell light bulb: W5W
Reading light bulb: W5W
Boot light bulb: W5W
Light bulb sizes for other VOLKSWAGEN POLO generations: POLO (MK4) / POLO (MK6)