There is a "hose barb" inside the old fuel hose. All you need to do is grind off the 6-sided fuel line crimp, and the old brass barb will pull out of the old fuel hose. Then you can use the old barb and male-to-male thread adapter knowing they are the correct thread. And you won't need to buy anything but the new fuel hose.
Be sure your new hose is marked "SAE J30" or it won't stand up to new ethanol laden fuels.
Hope this helps.