No. Seat belt fitting rules are not retrospective.
And Federal law only supersedes state law in areas that are withing the power of the Commonwealth under the constitution (or which states have passed on to the Commonwealth. There is nothing in the Constitution about motor vehicles, and since any powers not specifically mentioned in the constitution remain with the states, the only powers about motor vehicles that the Commonwealth has are those which have been agreed to by states or which exist because of specific federal powers.
Hence, for example, the Commonwealth can prohibit the import of vehicles which do not meet ADRs under its powers on international trade and treaties, but these ADRs only apply to vehicles being registered to the extent that state legislation says they have to meet ADRs.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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