73 Duster bumper swap ?

I eliminated the big steel bar support that goes behind the front bumper and just bolted the bumper to the "Y" looking brackets that bolts to the frame. I also elongated the bracket slots so I could slide them back in closer and have the bumper sit closer to the car. I have a 74 sport with no shocks and no more filler. Mine also had a 73 style bumper originally. I think... The only difference I can tell is the bolt holes behind the bumper guards. On the 73 the top hole is round, 74 both are square.