That tube kit is...
main tank to aux tank
aux tank out to center of car.
How bad is it rotten etc?
you can just cut out the bad area then any standard SAE J30Rx fuel line & any clamp. If needed, add extra hose to route far away from heat sources.
This line should never see any pressure as EVAP can is 0 pressure for that port.
hose types
https://www.fiero.nl/forum/.../HTML/144395.html#p6If car has Emission test for inspection use low pressure or other "soft" line so inspector can use a pinch tool easy to test the tank.
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)
The Ogre's Fiero Cave