Any seat that has a Swedish style tether is not legal to use here Only seats from NZ that have our 5 tick standard approval are legal to use here. NZ gets to use a lot of great international standard seats because they are allowed to share their standards. Here we can only use Australian Standard approved seats legally. Yes it would be a give away with a Swedish tether if pulled over and the police officer knew what to look for.

So, the Radians are not legal to use in Australia.