I contacted NAPA and they have ONE;
part # 7354351, for $12.49;
NOTE: this adapter is a "universal", and may NOT work; I am on my way over to find out now. Murphy's Law! If anything can go wrong, it will!
it uses NAPA oil filter #'s, as follows:
NAPA.............AC PF-25..........................$
O'Reilley........PH13 (FRAM).....................$
O'Reilley........Purolator TF-141................$
Still examining; got to run back to exchange filters; got wrong filter # too, initially, from the salesman.
This is NOT looking good; thinking of contacting Mr Gasket, and request that they develop an adapter specifically for the Ford flathead six!
I shall call them tomorrow & try to talk to some one in Engineering.