I recently upgraded my headlights to a different set up, so I have a set of Osram Xenarc CBI D1S bulbs for sale. I picked them up around x-mas of last year from one of our forum lighting expert upon his recommendation for an easy plug n play upgrade.
They are brighter by 20% and more white compare to the 4300k stock bulbs. They operate between 5000k-5500k so you have that slight bluish/white hue.
These are simply the best of the D1S bulbs.

Price: $175 shipped

paypal - 3blade@gmail.com

 

Are these difficult to install? Does the headlamp need to be removed? Interested. In the meantime, I'll do a search

 

For me this was very simple to install, but for those that are not familiar with removing the e60 headlights then it might take a bit longer. Overall it's not that hard. You can probably search for a how to remove headlight thread, then once the headlights are out, these bulbs just plug right in. I can probably do this now, without remove the headlights from the car. Just need to unbolt the mounting screws and move the headlight forward a bit to get more room for access.

 

sold