There was an aluminum deck lid on Ebay recently, but I've never come across anything more than rumors of an aluminum hood for a Regal. Do the Cutlass ones match up? I do see those from time to time.
They did make aluminum hoods for the Regals. I know because I have one for my waGoN. You can pick it up with one finger. Much lighter than even the fiberglass ones. Sorry, but it's not for sale.
Not saying they didn't make them, just that I've never been able to track one down. Cutlass hoods however I've been able to find, but don't know if the body lines match up.