Discontinued pretty much everywhere, but if you’d like to look even more original then this is the place to go:
https://www.kingswoodcountry.com.au/buy/car-rego-registration-label-decal-sticker-1953-198/HQR20
https://www.kingswoodcountry.com.au/buy/car-rego-registration-label-decal-sticker-1953-198/HQR20