By the way if you are looking up bulbs for your car and the ECE number is listed in the owner's manual, this Wikipedia page has some of the numbers you can find in the US listed for the more common bulb types
http://en.wikipedia.org/wiki/List_of...ght_bulb_types
I added some of them myself as I've got bulb charts for three different German cars saved on my PC, as I've stated before this isn't the first time I've done this. Had I found that page (if it existed) years ago would have saved me some slogging through catalogs and reading of faint little numbers on bulb bases!