Doug,
Only the all-chrome bumpers would be correct for your car, that goes for both font and rear.
Accident or not, at some stage the rear bumper was replaced on your car assuming its a factory high grille coupe.
Quite often these cars where modified, but usually a high grille car was converted to the lowgrille version, and not the other way around.
The low grille bumpers will fit your car, it just would not be original for a HG-car.
Hans