D2R is a Type of Bulb, for the MINI there is:
D2R or D2S
If you google that or search for 1 of those types in Ebay, there are plenty of 6000k bulbs around, I guess the 6000k aren't too blue, 8000k is very blue and more likely to gt you pulled over by the police.
So I would go for these:
2 x HID XENON REPLACEMENT BULBS D2R 6000K on eBay, also Head Lamps, Lights Lighting Accessories, Car Tuning Styling, Cars, Parts Vehicles (end time 16-Jul-08 00:48:40 BST)
Or similar, They will be the £20 to £40 mark, you can get more expensive bulbs which will be manufactured better but they are around £70 odd.