OK all done. Thanks guys for all the input. Here are a few observations should anyone else stumble on this thread. If you are doing this for the first time, like me, remove the tank and do this on a workbench. Much easier way to learn. Once you know how, life is good.
Aitex FS1 sock filter and Carquest FS260335 are the same size and both seem to work. The Carquest filter is made of a more flexible material and pulls in and out of the sump easier. Pulling the sender/pump out adjusting, measuring resistance, refitting just took me many tries before I was confident I had done it correctly.
I used POR-15 to refinish the tank. Usually I try to use this when the air temp is around 60-70. That way I can have two attempts to remove excess from the sump as it dries slow at this air temp. Despite my best efforts I still had a small amount accumulating down there. Which raised the floor a wee bit for the sock filter. So I shaved a bit of rubber off the connecting hose for the sender/pump and everything fit fine.
Now onto the main 3 port fuel pump........joy joy joy.