I honestly have no idea. I ran across them by accident, looking for Opel glass. 73smallblock is in PA, shipping and packaging for a hood cross country is nuts, and Glory Days is in PA too.
My local place doesn't build anything for my cars that I would buy glass for (they do for the Cuda, but it doesn't need any glass.)
Bill just bought stuff from unlimited, they have cowl hoods for your Duster from 3" to 9" high.
(If you get grief for the cowl, tell em it's an oversize 70 road runner scoop, lol)
Edit: if you do 290 miles in three hours, you're hauling ***, and more of a gambler than me!