Vauxhall ASTRA Owner's Manual page 285

280 Self-help
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5. Remove the round seal from the
fastening bolt. Press the locking tabs on
the outside of the bulb holder outward
and remove the bulb holder.
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Bulbs in bulb holder:
1 = Reversing light
2 = Turn signal
3 = Tail light / brake light
4 = Tail light
5 = Fog tail light
6. Remove bulb from socket.
7. Insert new bulb, without touching the
glass.
8. Engage bulb holder in bulb housing,
ensuring that it properly engages.