70-76 Demon,Dart sport,Duster Pictorial History

just a guess here. are the fenders the original fender? if not sure then i think that they might be from a 73 dart sport 340. this is the onlt fender that had the additional holes like you are talking about. i am not sure if they interchange. the dart for 73 said "sport" then above it it had "dart 340" only other choice is it is a 74 fender. the duster had "duster" with "360" under it.