Vauxhall ASTRA Owner's Manual page 278

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3. Rotate left bulb holder and disengage.
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4. Remove the bulb holder with bulb from
the reflector.
Self-help
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5. Detach bulb from bulb holder.
6. Insert new bulb into bulb holder,
without touching the glass.
7. Insert new bulb so that the two lugs on
the bulb holder engage in the recesses
in the reflector.
8. Rotate bulb holder to right as far as it
will go.
9. Place headlight protective cover in
position and close.
10. Position cover on opening in wheel arch
and engage.
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