I called the local BMW Parts Dept. to see about getting one of the factory BMW batteries for my car. Figured that maybe the 3 series battery would fit. They are white with a BMW emblem and should look good in the engine compartment. Didn't go too well. The response from the tech was "What's an E9?" I wanted to respond that it is the car that is plastered all over the walls of the service department in various incarnations in order to imbue a sense of history to the marque, but figured it might be easier to just hang up.