Adding horsepower by choping off the weight

Gentlemen, i will answer 71 duster 440 first. I dont no if your 71 stock brackets will work or not , my car is a 74 and our bumpers were different. If i was you, i would not use the stock brackets anyway,you can pick these bumpers up off the floor with one finger, why use old heavy brackets that way about 10 pounds each to support a 3 or 4 pound pumper. Eric 568 made his own brackets out of 1 inch flat stell, that sounds like the way to go. To answer your question Pettybludart, i never bought both the front and back bumpers together, but i should because i paided twice on a shipping and handing charge. The bumpers are 149.00 $$$ U.S for each one, plus a 45.00 U.S shipping charge,plus UPS charge of about 50 Canadian. Check out there website www.aarqualityfiberglass.com