I am going with McMillan Fiberglass in Ontario Canada. http://www.mercury-pickup.net/mcmillan.htm

These are the BEST fiberglass fenders I've ever seen and he uses high quality resin. To show the durability he laid a fender on it's side and stood on it and bounced. Now try that with any other fiberglass and it will crack in an instant. They are heavy gauge and they guarantee that there will be no air bubbles at all. They even put marks in for where you need to drill holes. The 1942-46 chev fenders are the most exact set of fenders I've ever seen. Check them out and be amazed!

1946 Chevy Half-ton

In the Stovebolt Gallery
More pix on Flickr