READ HERE FOR FILTER - https://www.ford-trucks.com/forums/1300601-y-block-fuel-pump-filter-and-spring.html

Ethanol blended gasoline will break down a cellulose filter element.

Crossover Listing For Current Filter Elements - C3TZ 9365-A (FG-16)
- https://www.fuelfilter-crossreference.com/convert/MOTORCRAFT/FG16

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I’d be concerned over the condition of the diaphragm with today’s fuel. It’s very possible a newer compatible one is available even from pump rebuilders. With that said, I have the same pump on my 56. There is no filter in the bottom since I have not found one. I use 1 oz. of Stabil-Marine in every fill up and have for the 9+ years I owned the car. Everything was new when I bought it bought it and the diaphragm material is unknown to me. I do have a glass AC filter leading to the carburetors and the inside of the tank is spotless. 

56 Vic, B'Ville 200 MPH Club Member, So Cal.

There is a NOS AC 4421 Double-action vacuum fuel pump/w integral glass fuel filter on SF Bay Area Craigslist. The seller wants $195. Considering there have been numerous complaints about the poor quality of new fuel pumps, I thought someone might be interested.

sfbay.craigslist.org/sby/pts/d/san-jose-ford-thunderbird-galaxie/7332709296.html