i was wondering if anyone could answer this for me. is the dock port size the same for the ipod 3g and 4g? like could i use my 3g dock cable for a 4g ipod? the reason why i ask this is because i know apple made a new dock for the 4g ipod, so i'm a little confused. i'm gonna be installing the ipod adapter into my 3 series bmw. i currently have a 3g ipod but have been contemplating a new 4g. the ipod ur bmw site doesn't mention anything about the adapter working with the new 4gs. so i was wondering if the cable would work for both a 3g and 4g ipod. thanks.