I'm surprised they require retro-fitting (car didn't originally come with seat belts). On the other hand, AU could export those used seatbelts to needy countries (like the US) that have a shortage of good belts for older cars.

SA isn't alone on the plate issue: in Washington State we have a new law, we are required to buy new plates if they are more than x years old, even if they look brand new. I guess the police got tired of worn-out plates they couldn't easily read. Solution? Require everyone across the board to pay $14 for new plates