From what I have read on-line, Fulton are Aluminum, Dieterich are steel. '49-52 Chevy visors were made by Dieterich for Chevy/GM. For all visors, the end brackets are unique to Truck or Car, so watch out for that when you get the end brackets. The best one to buy may be the one that you find available. They do not seem to be adjustable for width, some are too wide for our trucks.
