For what it's worth, I was recently searching for a supplier that specifically sold the Precision Brand windshield gasket with the extra slot for the stainless trim. I ended up buying it from American Classic Truck Parts. I spoke with customer service and they stated they sold 6 different brands. If I wanted a specific brand just make a note in the order and that’s what they would send.
I entered the note in the information field, and they sent me exactly what I wanted. They were also cheaper than many of the other suppliers. If I were to do it again I would call their customer service dept before placing the order, because they will go the extra mile. In fact my first question was placed at 11 pm and I received the response before midnight!
http://www.americanclassic.com/asp/d...to&exyear=1963