So I dug into my fuel tank and found that I someone was definitely there before me. The small hoses were definitely not OEM. The gaiter matched the alleged thicker one that I bought from eBay, so I can’t offer a comparison between the two.
Apparently I have a fuel tank from a v12 6.0 engine! The flange at the top of my tank is metal and only has one small hose connection tied to it, I used a 3/8” Gates Barricade hose section, only 1-1/2” piece is needed. I think it’s fine at the flange connection, but too large for the pipe I’m connecting. I’m gonna go back in there and try a 5/16” hose next weekend, after I burn through the tank of fuel.
For those keeping track, you only need a 3” piece to connect the metal vent pipe to the fuel filler assembly, again, perhaps the 3/8” may have been too big, but hose clamps probably did the trick there,
There are no other rubber hoses needed for my fuel tank, which definitely disagrees with what JDHT shows. Even if I were to replace the metal flange (NNA5954AA) with the seemingly correct plastic flange (NNA5955AA), I’d have too many hose connections and not enough pipes to connect them too! They also no longer make a flange gasket for the plastic flange….
Lastly, I did buy a 3mm piece of Viton and plan on exchanging out that fuel sender gasket. The sniffer is still telling me it’s leaking fumes.