70-76 Demon,Dart sport,Duster Pictorial History

On my '73 Duster,above the 2 holes for the Duster badges,on both front fenders,there are 3 more holes. The only thing I can think they would be for,are Plymouth emblems. I don't remember seeing those on other cars,and don't see any in these pics. I'm planning on having them filled in. Any ideas,suggestions? By the way,this is an 'H' code car.