D3 Headlight goes pink!

[A8Jas]

I've had a quick scan of the forums and think my nearside healdight bulb is on it's way out as it's colour shifting. There has been a very intermittent problem with it cutting out going up the short term car park ramp at heathrow but only then (adaptive light issues?) So I'm going to change the bulbs first and have found some reasonable instructions on how to do this.

But I need to make sure I'm getting the correct bulbs first, am I right in assuming all D3 had Xenons? (what are bi-xenons then?) Can I order any D2S bulb off ebay? Web comments seem to recommend 6000K colour temp but are there any other things to check - prices seem to go from £3.99 to £139!

Thanks

Jas