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[zetecblue]

I have just had my Zetec Blue repaired and noticed that in the new headlight on the passenger side there is a small round silver plastic 'cover' over the bulb in the headlight.Strange thing is on the drivers side there is no cover just the bulb.Now I've noticed it it looks odd and Ive had a look at other mk6 fiestas and some have them some havent.
Does anyone know what is is?? and what it does??