which type of headlight bulbs?

I have a 2004 330Ci and the driver side bulb (original) didn't work this Am, but started later in the day. If it was not a short and I do need to order new bulbs can someone please tell me which type of bulb is actually required. I believe it has the Bi-Xenon design. The manual states H7 but I have also read D2S. please end my confusion thanks scott

Only sure way without knowing your car better, is to take that broken one out and go to store with it and buy which looks similar.

They're often sold in pairs and might want to change other side at the same time for making sure they are all the same.

Those light bulbs can be different colors and brands, so car might look funny if one side is different than other.

Don't get ripped off for bulbs and just get them from ddmtuning. Cheap and they work. I've had the same set of bulbs in my car for over 3 years and there from ddm. Just take one of your headlight bulbs out and see what the model # is on it.