I know this been on my swap list for some time.
I have a sidelight non ford, but uses a simular lens, to the ford. Its 3" dia not 3 11/16"
My question anyone know of a source for one or a way a repo ford lens could be cut down
That IS an uncommon size as you know because of how hard they are to find.
I may have a spare. Can you post a picture of the one you have and are trying to match? Bill