There are a few places that sell fiberglass parts, but I would recommend against them. I have a 'glass hood on my 68, and am not happy with the fitment. An 'extra' steel hood would be a better way to go, on a street car. http://www.usbody.com/Pages_Cars/67-Cougar.htm
I got mind from US Body, the fit was actually not bad. But shipping was tough. My bumpers and rear decklid came from that place in Canada, can't remember the name. I could find them again if you need but parts were pure crap...had to do a ton of work to make them look decent. They were very light weight which was what I was looking for but the shipping and Canadian customs were a nightmare, took the guy like 5 months to get me the stuff after he took my money. He has hoods but they are UGLY for the most part. If we had enough interest we could get Maier Racing to mold us one??? Anybody???