i've just had a car capsule fitted into my car and the fitter at the ambulance was telling me all the new regulations coming in as of june this year. if i we're you i'd ring the ambulance in your area and ask them, cause i'm not sure if each state is going to be different.
she mentioned something about when i change to a older car seat it would be advisable to buy a AHR seat so it lasts longer and it used to go off the childs weight and now it goes off their age.