Ford part numbers are pretty easy for pre-97 stuff.
First digit denotes decade. F is 90s, E is 80s, D70s, etc
Second digit is the last digit of the year. So F6 means 1996. F2 is 1992.
Third digit denotes what production class. A for automobile, T for Truck, Z for a service part.
Fourth digit is pretty much useless for us. However, if you see a Z in the FOURTH slot, that means it was an SVO/SVT/Race part.
The next few digits refer to a specific part type. All distributors, whether from the 60s or 90s, will have the same 12127 part number.
The next one or two letters denote revisions to the part from testing.
Now the last part. These part numbers refer not to when it was produced, but for what model year it was for, and any subsequent years until a new part was needed. So an F2TF PSOM will be used in a 93 and 94 and so on until they needed to make a drastic change