Opel Automobile Owner's Manual page 148

148 Vehicle care
2. Push bulb into socket slightly,
rotate anti-clockwise, remove and
renew bulb.
3. Insert bulb holder in reflector,
rotate clockwise to engage.
Tail lights
5-door passenger vehicle
1. Open side cover.
2. Remove plug connector by
pressing on bulb holder tab.
3. Hold bulb housing from the
outside; unscrew two retaining
nuts.
4. Detach bulb housing towards the
rear.