I just changed my 2011 MY X6 40d side bulbs to some GP Thunder 7500 ones. 2 minute job for both sides. Bonnet up, lean head in and see the large circular plastic blanking plate with upturned edges at rear of light assembly. Grab hold, twist a quarter turn and off it comes. You will see the bulb holder directly in front of you. Again a quarter turn and it comes out. Do not touch bulb if it is still in workable order as you can keep it to refit later should you change car etc. Small grey plastic clip on bottom of bulb assembly unclips both sides (careful now these are small and easily broken clips - lift them with a fingernail one by one) and pulls out. In true Haynes style, re-assembly is then the opposite of dis-assembly
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I can post up pics if you really need them but it's a very simple job requiring no tools at all.
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