I'm replacing the fuel filter on my 1970 IIA and have a few questions:

1) what size does it take? I've got a generic 5/16th one that I'd like to use
2) what direction does it go in? The generic one has an arrow on it - is that the direction of the fuel flow?
3) I was surprised to see that my truck has 2 fuel filters, one on each side of the electric pump. Is that normal? I was going to replace the hoses too and just install one pump near the carb so I could see if there's fuel in it, and to make it easier to reach next time.
4) Any suggestions on where to buy that metal braided fuel line? I've had a vapor lock problem. My local auto parts stores don't sell it.

Thanks