Kiwi Ants

Hi all. I have a 56 Buick Special. No power steer or power brakes. I would really like power steer. Is this add on option easy to find? I am in NZ so Buick parts here are non existent. So I would need to get something from the states. I suppose I am looking for some guidance on "If its possible?" and if it is "How hard is it to find?" Re the brakes is there a factory option or is aftermarket the only way. The car is original with 80k miles so am trying to keep as original as possible. Thanks all