5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
First of all, I have NO affiliation with this guy, but he makes a great product that works in conjunction with some of the products sold though bimmerwerkz sponsors. I upgraded my e39 to xenons and had a hell of a time securing them to the lamp housing. I ended up just holding it in place with metal wire (bad idea). I found this adaptor on eBay that someone makes in their free time and it makes a world of difference. The bulb is now secure and doesn't bounce on bumps at all.
Yeah, I remember that being a true pain in the butt on my E39. I wound up taking the stock halogen bulb holder and used a dremel tool to cut off the wiring plug and bore out the middle. It didn't look nice, but it did the job 100%. That adapter looks like a clean version of what I did, and trust me, like a charm it works. The only problem I had was that after repeated taking-out-and-putting-in of the xenon bulbs, the little plastic tabs around the outside that latch the holder in broke. I was thinking about ways to address this problem that would be more permanent than my stopgap measures when I totalled the car, making the question moot. So I'll endorse his idea, with the proviso that you don't want to disturb the bulbs very often once you've got them in. I was forced to due to mixups with Umnitza; don't make my mistake.
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