Australia, New Zealand & the South Pacific - Car charger - adapter

Hi,

I am hoping that someone can direct me to information regarding an adapter for an automobile electric receptacle. As I understand, my US cell phone/ Zune/Ipod chargers that I use in my car will not work in the NZ auto plug receptacle because the end is different.

I am searching for the piece that converts a US charger into a NZ car charger.

Thanks,
Maggie