I got my reproduction shroud from here:
http://amhightechauto.com/
I was an early adopter. The first two melted and sagged. This was a few years back. Bill at A&M work with the manufacturer and finally got me one that fit good and did not melt. The shroud has made it through the quite a few summers no issues. Oh, and when Bill sent me the replacement shrouds I paid no shipping and he kept sending them to me until I finally got one that fit right and did not melt.