Xenon headlight bulb fitting

yeahhluke

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Hi guys,

I've recently bought myself a 56 plate 3 door A3 with the xenon headlights, and I've noticed that one of then is a slightly dimmer colour.
From reading through a few threads in here it looks as though the bulb may be on its way out, before it goes I want to get them changed but I can't seem to find the correct fitting? I think they are D2S bulbs, but I've also read they could be D1S or D3S too, can anyone confirm the correct size please before I order?

Also it looks as though I'll have to remove the front bumper to fit them? Is this true or is there an easier way?

Thanks in advance