Which iPod car mount with DICE

Sorry if this question has been asked already but I've searched and could not find any post. My question is this: Which car mounts have a docking adapter at the bottom to plug the DICE cable into so that all I need to do when I get in the car each time is 'drop' the docing cradle just like my desktop dock? I'm looking for a one step solotion here and there does not seem to be one availale. Thanks!