Add to Type A Trans Fluid with ???

[jplutz]

Greetings,
I have just acquired the parts to have my Fordomatic pan gasket replaced along with the screen. The local shop says I also have to supply the fluid. So I shopped for Type A as specified. Couldn't find it. Looked online and was directed to an old Ford Barn Y8 & Later site 5 years old.
Does anyone here have knowledge of the replacement for Type A. It is no longer produced.
My pan is leaking from the attachment bolts on all sides. I have No knowledge about this trans being rebuilt. As far as I know it contains Type A. I inherited 2 quarts with the car.
The previous owner had passed. Great guy..
So, I have the ability to Add to the current fluid. I don't have the means to get that trans rebuilt or replaced. Is there a current ATF that I can Add without damaging the internal parts?
The other Ford Barn thread appeared to be talking about replacement instead the adding to current fluid. I put a message on that thread also, even though it's so old( like me ) ha ha.
If anyone can help, I would sure appreciate it.
Yours Truly, JP