"Volvo Light Switch, Control Panel, Headlight Switch, Original Volvo V50 S40, Part No. 30669735 Used Product"

Your chassis number is on the back of your registration certificate. And also in the car

1. On the bottom plate for the right front seat
2. Center against bulkhead under the hood
3. Right in the engine compartment
4. Near the windshield, on the dashboard
5. In the right rear door pillar