1. Check your owner's manual: This is the best and most reliable source. It will specify the exact bulb type for your specific year and model of Chevy Corsa.
2. Look at the existing bulb: If you can safely access the bulb socket (often requires removing the light assembly), carefully remove the old bulb and check the markings on it. The markings will indicate the bulb type (e.g., W5W, T10, etc.).
3. Consult a parts store website: Websites like AutoZone, Advance Auto Parts, or similar will let you search for bulbs by your vehicle's year, make, and model. They'll show you the correct bulb.
Without knowing the year of your Chevy Corsa, it's impossible to give you the correct bulb type.