license plate dell , did some research and i've ordered those : here is the technician reco for our model
The license plate bulbs for your BMW are listed as 6418 which are the 36 - 39 mm festoons

You will want to measure the bulb to be sure which length you need, tip to tip.

The chips work with most but not with all bulb out warning systems, so sometimes there is some trial and error involved in finding the right match for your car. Unfortunately, I do not know what chips are required for your specific car since it really is specific to each vehicle, not even to each make/model/year.

The festoon canbus leds are on this page here:

Canbus Eliminate Electronic Bulb Out Warnings LED Bulbs | Autolumination

Both the Cree XPE:

Canbus Eliminate Electronic Bulb Out Warnings LED Bulbs | Autolumination

and the 5050 8 smt are really nice options.

http://www.autolumination.com/images...us_8led_wm.jpg

http://i1156.photobucket.com/albums/...psl3zztu4e.jpg

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2006 X5 4.4i premium, Sport package ,Winter Package, Sat Nav. AFE Power stage II Production : 08-2006
2012 BMW 128I Convertible Black
2011 Mercedes Benz B200 sold