I don't think your going to be happy with AMD bumpers. Dave at Roseville(a sponsor here) sells Keystone bumpers. They are nicer then the bumpers from AMD. He also sells bumper brackets and the stainless carriage bolts. I know he offers a discount so contact him for prices.
You're also going to need the two rubber filler pieces that were on the ends of the 70-72 front bumpers. I think Dave sells those as well. 70-72's had a metal filler piece below the tail panel. If you don't use that filler, you'll see the ground between the bumper and tail panel.