You will be required to comply with Australian Design Rule 22 if you intend to personally import a vehicle.
This Australian Design Rule (ADR) is referred to in the Catalogue of ADRs (3rd Edition) as ADR 22/00 Head Restraints. The function of this ADR is to specify requirements for the design of head restraints so as to limit the severity of injury in the event of rear-end impacts and to ensure that head restraints cannot be adjusted too low.
Personally imported vehicles are vehicles built after 1968 that are imported by a person who owned and used the vehicle for a continuous period of at least three months before it was imported into Australia, and the person who imports the vehicle is an Australian citizen, permanent resident, or a person who has applied to become a citizen or permanent resident. The person must be old enough to hold a licence or permit to drive the vehicle, and must not have imported into Australia another vehicle that they own within the previous twelve months.