Calling all Aussie members-who are you!

If you buy a car with left hand drive in oz do you have to by law convert it to right hand drive or is there a.cutoff year say when the car reaches 30 years old you dont have to modify it in this way. I imagine its a lot of work to convert a u.s. Spec muscle car to right hand drive and make it look like it was built that way.

Please tell me im curious
Matt

Mad max Falcon XB GT fan in the states