Unless you have a new or rebuilt pump, I have heard that Power Steering Fluid should not be used with the early Ford pump. The reason I heard that the PSF tends to leak on older pumps because it is made of a different composition than ATF.
I can see not using Type F in a trans, but it's probably ok in the power steering pump
You can get the filters from most resto parts suppliers, but I got mine from Baldwin Filters, Part # P183. Made in USA. Power steering fluid is supposed to be Type A, ATF, but as a substitute, you can use Dexron/Mercon fluid. Same fluid should be used in old Ford-O-Matic transmissions.
TYPE A is very old tech. It was superseded by TYPE A/Suffix in 1959 and again by DEXRON (GM Marketing Term).
TYPE F was introduced by FORD in 1968 as it had a special friction modifier to be used with then new frition materials. It was also used in some FORD PS Systems (Refer to Owners Manual).
The problem with continual use of a certain type of fluid also changes if and hydraulic part is rebuilt and then the fluid type has to be compatible with the replacement seal(s) material.