There was a period of time (I believe between '73 and '74) when this law came into effect that many cars were cosmetically ruined. I can still recall in '73 the hideous black rubber bumpers mandated on the fronts only of many sports cars ie. Corvette's, Jag's, Pantera's, Porsche's etc. The cars looked ridiculous with their sleek, form fitted chrome rear bumpers and their fat black bulbous "stuck on at the last minute" fronts.