Fuel Line Fitting

[BAMO]

I need a little help with the inverted flare fuel line fitting. The little gasket that went on that fitting is toast (between carb and fitting). I also need a new inlet fitting. Truck is a 65 c20, 283, with I presume the stock rochester carb on it.

So the questions are:

1. If I get the inverted flare fitting, or more importantly, what are the dims I need - similarly what are the dims that I need to be aware of for the hardline that runs out of the inverted flare.
2. Where can I get that gasket (I think it is a 7/8 but am not sure) and what exactly am I looking/asking for - aside from it being supplied with the inverted flare.
3. Lastly what other options are there besides the stock inverted flare with hardline - any suggestions?

Thanks in advance for any help. I know the questions are pretty rudimentary but any help is appreciated (and I really don't want to take it off yet again to measure, and order 3 of the wrong things before I get it right).