A few oddball questions about the Duster

How much weight savings come from using glass bumpers and alum brackets over the steel?

How much weight savings come from using a non hinged glass hood over the steel hood & hinges?
I'm not sure on steel hood weight but some manufacturers list there hoods weight. Hinged and lift off weight differences are a couple of pounds while the steel vs fiberglass is a good bit more.
Same with bumpers.