My fiberglass fenders are way lighter then my metal ones. I'll bust out the scale tomorrow and see by how much.JC Whitney in Chicago sold glass fenders and other parts back in the day. I have a pair, not sure of the brand, on a car I bought in Iowa over 30 years ago. Also picked up a 64 deck lid that I saw at at least 20 swap meets. I doubt if I'd ever use it. I think those glass fenders may have been heavier than the steel ones.