Just a quick update. I have found one! I was pretty lucky in locating such a hard to find piece. The markings are on the left of the fan opening on the inside (engine side), face. The top line (no pun intended), says "TOP", with a line below, "Barnum Bros Fibre Co, Inc" and a final line below, "D1ZE-8146-BB". It's unbelievable how heavy it is due to being constructed of thick fiberglass, especially when compared to the molded plastic shrouds!