72 bumper on a 74 HELP!!!??

Hey there. I had a 74 Plymouth that was the inspiration for my screen name. I backdated the car to appear like a 71 Duster 340.
For the front, I had to make my own way to secure the bumper brackets. The 67-early 74 used captive nuts welded to the inside of the frame rails. The late 74 thru 76 cars used that shock absorber style. I made a steel plate with 2 nuts welded to it and slid it inside the frame rail, then welded the plate in place with 4 plug welds.
For the rear, I just welded over the huge hole that the shock passed thru, then drilled holes where the 70-73 brackets were mounted. Yes, there was a gap between the sides of the bumper and the quarter panel. there were gaps in the 70-73 models too, but the earlier cars had a flange on the quarter panel that extended rearward to block off the gap. I didn't notice it on mine until I went to mount the bumper. Of course, this was after I had painted the car. If I were to do it again, I'd fab up something to fill the gap so that it looks like the 70-73 cars did.