Weight difference between glass and steel bumpers on 71 duster/scamp

I don't know for your car, although I read it somewhere on Moparts a year or 2 ago for a 70's duster, I just can't remember....

For my 67 Barracuda the front bumper with brackets is 33lbs. I also know if I pull this off the car usually picks up a tenth (thanks to the better weight transfer). I would leave the rear bumper stock to keep the weight on the rear to help plant the tire...just my 2 cents.