FYI,
52 lbs each(front & back)74-76 chrome plated bumpers w/reinforment bar.
12 lbs each(front & back)77-78 aluminum (no reinforcement bar needed).
6 lbs each(front) 74-76 bumper to frame brackets.
3 lbs each(front) 77-78 bumper to frame brackets.
I saved a total of 86 lbs switching to the aluminum bumpers and front brackets!
Forget my New Years resolution to lose weight to improve my gas mileage, ha, ha !!!