I just found a part looks like the rubber cover very much in realoem.com. The part number is 63126902509 and called 'LAMP COVER LOW BEAM', which is used in E38 7er's hid headlight. Can anyone who own an e38 7er tell me if it is same with the one used in e53 X5? Thanks a lot!

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--2004 E53 X5 4.8is - ECE version; right hand drive; Located in Hong Kong; ext. black sapphire metallic; int. leather black; adaptive dynamic bi-xenon headlights; 16:9 onboard monitor w/o navigation; 20" genuine BMW Y-spoke 214 wheels with Bridgestone Dueler H/P Sport tires; Int. rear view mirror w/ compass.