When you go to your automotive store, ask to go back and look at the tubing. Some fuel line is more flexible that the vacuum line. In your case, try to match up what you have and fuel line is most likely going to be it. Don't buy the end of the roll.
When I did the breathers on my 2015 JKUR I found front & rear diffs, and transfer case. I never found a breather for the transmission so I asked the mechanics at a CDJR dealership and got 2 different answers, one being that the breather was built in to the transmission dipstick tube. So I asked just that on this forum (a few years ago) and cloaked willy's agreed that it could be possible that the auto trans breather is the trans fluid level dipstick.
If anyone out there knows conclusively one way or the other please chime in.